Atlas D Site 549-B Missile Silo, Arlington Nebraska

Atlas D Site 549-B was a former SM-65D Atlas intercontinental ballistic missile launch complex operated by the 549th Strategic Missile Squadron near Arlington, Washington County, Nebraska. It was one of three Atlas D complexes associated with Offutt Air Force Base and Strategic Air Command headquarters near Omaha.

The site was not a single isolated Minuteman-style launch facility. It was an Atlas D three-launcher "coffin" complex with three launch and service buildings, a shared launch-control function, and supporting power, communications, and maintenance infrastructure.

The site is inactive and decommissioned. Site-specific public sources list 549-B as activated in spring 1961, deactivated as an Atlas D missile site in December 1964, and decommissioned in March 1965. U.S. Army Corps of Engineers documentation states that the property was declared excess in 1966 and transferred to private ownership in 1969. Since transfer, the remaining buildings and land have been used for agricultural and storage purposes, with the surrounding land used primarily for livestock grazing. The property is a Formerly Used Defense Site with documented groundwater contamination and no public access.

Location, Landscape, and Site Description

Site 549-B lies in rural Washington County, Nebraska, about four miles northeast of Arlington and roughly northwest of the Omaha-Offutt area. Its siting reflected the Atlas D pattern used around Offutt: a small number of large, manned launch complexes placed far enough from the base and from each other to reduce vulnerability, but close enough to allow support, communications, security, and maintenance from the parent squadron.

The former complex occupied 274 acres. USACE describes the site as having been used for maintenance, storage, and potential launch of Atlas D ICBMs. The Atlas D at this type of site was kept horizontally in aboveground reinforced-concrete "coffin" shelters. At launch, the shelter roof opened, the missile was raised to a vertical position by a hydraulic erector, liquid oxygen and RP-1 kerosene were loaded, the radio-guidance system was aligned, and the missile could be launched.

The physical arrangement is visible in historic and modern aerial views: three launch/service buildings arrayed within a looping road system, with a central operations/support area and associated hardstand, access roads, flame-pit areas, utilities, and open pasture around the structures.

Strategic and Cold War Context

Atlas D Site 549-B was built during the first operational phase of the American ICBM force. The Atlas missile family was the first operational U.S. Air Force ICBM, and Atlas D was the earliest deployed model. These first-generation weapons were large, complex, liquid-fueled missiles that required elaborate support facilities, frequent maintenance, and carefully trained crews. Unlike the later solid-fueled Minuteman system, an Atlas D missile was not sitting underground ready to fire instantly from a hardened silo. It was kept in a horizontal shelter, maintained on alert, and then raised, fueled, and readied for launch after execution orders.

The Offutt Atlas D field had symbolic and operational importance because it stood near Strategic Air Command headquarters. The 549th Strategic Missile Squadron's three complexes at Mead, Arlington, and Missouri Valley formed a compact Atlas D missile force near the command center of the U.S. strategic bomber and missile force. During the early 1960s, before Minuteman became the dominant ICBM, sites like 549-B represented the transitional period between bomber-centered nuclear deterrence and an increasingly missile-centered alert posture.

Construction and Activation

Construction of former Offutt Atlas "D" Missile Site 2 occurred between 1959 and 1960. The site was part of the three-complex Atlas D deployment around Offutt AFB: Site A near Mead, Nebraska; Site B near Arlington, Nebraska; and Site C near Missouri Valley, Iowa. Each complex contained three missiles, giving the Offutt Atlas D force nine missiles in total.

The 549th Strategic Missile Squadron had a complicated designation history. The Offutt Atlas D sites were initially associated with the 566th Strategic Missile Squadron before the 549th designation was transferred to Offutt on 1 July 1961. The 549th SMS was then assigned to the 4321st Strategic Wing and later to the 385th Strategic Aerospace Wing. T Lincoln Air Force Base Legacy Project material describes the Offutt Atlas D unit as operational on 30 March 1961 and redesignated to the 549th Strategic Missile Squadron on 1 July 1961.

Missile System and Technical Role

Site 549-B was equipped for the SM-65D Atlas, also identified as the Atlas D ICBM. The Atlas D was a liquid-fueled, rocket-powered intercontinental ballistic missile. USACE describes the missile as using all-inertial guidance and a propulsion cluster of three Rocketdyne engines, made up of two booster engines and one sustainer engine, plus two small vernier engines. The propellants were liquid oxygen and highly refined kerosene. Association of Air Force Missileers material describes Atlas D coffin sites as using soft, aboveground horizontal coffins, three missiles and one control center per complex, and a ground-based radio-inertial guidance system.

Public-source missile capability summary: the National Park Service describes Atlas D as the first ICBM ever deployed, a 75-foot missile with an approximate 5,500-mile range and a 1.44-megaton warhead. The 549th SMS site identifies the Atlas D used by the squadron as carrying a General Electric Mark III reentry vehicle and a W-49 nuclear warhead of approximately 1.44 megatons.

Operational History

Site 549-B's active service was short but intensive. The three Offutt Atlas D complexes were manned around the clock while the squadron was active. AtlasMissileSilo.com describes the 549th SMS sites as staffed 24 hours a day, 365 days a year. That was necessary because Atlas D was a maintenance-heavy liquid-fueled system. The missile's thin stainless-steel airframe required pressurization, and launch readiness depended on fuel, oxidizer, power, guidance, pneudraulic, communications, and safety systems all functioning together.

A typical Atlas D crew did not simply wait beside a sealed underground silo. The crew and maintenance force had to keep a large launch complex ready. The missile normally rested horizontally in its coffin shelter. If a launch order came, the roof would open, the missile would be raised, propellant loaded, and guidance prepared. The Association of Air Force Missileers summarizes an Atlas D countdown as roughly fifteen minutes for the first missile at a complex, with the second and third missiles following later in the sequence. Routine operations also included inspections, maintenance, propellant and oxidizer support, and periodic loading exercises.

The 549th SMS was part of the first generation of operational ICBM duty at Strategic Air Command. Its three Atlas D sites near Offutt gave SAC headquarters a nearby operational missile force during a period when the Air Force was still learning how to organize, crew, maintain, and alert liquid-fueled ICBMs. The squadron's alert mission was especially visible during the Cuban Missile Crisis. All 549th sites were at a high level of alert during the crisis and ready to launch if ordered.

The 549th SMS also participated in operational missile activity away from Nebraska. The Air Force lineage summary records that a combat-ready crew from the 549th SMS successfully launched an Atlas missile from Vandenberg Air Force Base on 11 April 1962 and that four crews from the squadron participated in missile launching from Vandenberg in 1962. These were squadron events, not Arlington site events, but they show how the Offutt Atlas D crews were evaluated and trained within the broader SAC missile program.

A later site-specific event occurred long after missile service ended. The environmental restoration of former Offutt Atlas D Missile Site 2 became a recognized USACE cleanup project. In 2014, USACE reported that an Omaha District Environmental Remediation team working on the Arlington site won the Secretary of the Army Environmental Award in Environmental Restoration-Installation for 2013. The award was tied to remediation work on the former missile site's trichloroethene source area and groundwater contamination.

Deactivation and Disposal

The Atlas D system was quickly superseded by more survivable and more practical ICBMs. The Atlas D coffin-launcher layout required large aboveground structures, careful pressurization, liquid oxygen handling, and complex maintenance. Later Atlas E, Atlas F, Titan, and Minuteman deployments offered improved basing, guidance, launch response, or maintainability. By 1964, the Atlas D force was being phased out.

Sources record several different dates for the end of Site 549-B, and they appear to refer to different stages. USACE states that the former Offutt Atlas D Missile Site 2 was declared excess in 1966 and transferred to private ownership in 1969. These should be read as separate steps: end of operational missile duty, site decommissioning or closeout, formal excessing, and property transfer.

USACE documentation gives the clearest post-missile history. The 274-acre property was transferred to private ownership in 1969. The former site buildings were later used for grain and miscellaneous storage, while the land was leased and used primarily for livestock grazing. The launch/service structures and other built remains therefore survived not as an active military installation or public historic site, but as privately used former military infrastructure embedded in rural agricultural land.

The most consequential post-closure issue has been contamination. USACE identifies trichloroethylene, cis-1,2-dichloroethene, and vinyl chloride in groundwater above federal maximum contaminant levels. The contamination is suspected to be connected to solvent disposal or accidental spills during missile-site operations or decommissioning. USACE explains that routine maintenance involved cleaning rocket fuel systems with TCE and that waste TCE and residual rocket fuel were washed into Atlas D Flame Pit Areas and presumably burned. Seasonal water in the flame pits then helped contaminants leach into soil and groundwater.

The cleanup history is unusually well documented. USACE hired ITSI Gilbane in 2008 to begin remediation of a 62-acre area of TCE-impacted groundwater. Investigations in 2009 and 2010 found a more serious dense non-aqueous phase liquid source area than initially recognized. USACE and its contractor selected an in situ thermal treatment using large-diameter augers and zero-valent iron. Crews advanced eight-foot-diameter augers to depths of more than 40 feet and treated 163 cells, including cells used to create a barrier around the source area and others treated with augering, steam, hot air, and zero-valent iron. USACE reported post-treatment reductions of 99.98 percent in TCE concentrations in source-area soils and 99.72 percent in source-area groundwater. The flame-pit area was dewatered, backfilled with 6,500 cubic yards of clean sandy clay loam soil, leveled, and revegetated, returning the affected pasture area to usable condition.

Current Status and Site Use

Atlas D Site 549-B is decommissioned, privately owned, and not open to the public. The former complex remains identifiable in aerial imagery and in the surviving pattern of roads, hardstands, launch/service building remains, and related infrastructure. USACE states that since transfer to private ownership in 1969, buildings have been used for grain and miscellaneous storage and the land has been leased primarily for livestock grazing.

The site is also an environmental cleanup location under the Formerly Used Defense Sites program and appears in EPA's CERCLA database as OFFUTT (EX) AFB AF FAC S-2, EPA ID NEN000703237. EPA lists the site as not on the National Priorities List and identifies it as a Washington County site near Arlington. The environmental record is therefore part of the site's post-Cold War history: 549-B is not only a former missile complex, but also an example of the long-term environmental legacy of early liquid-fueled ICBM operations.

Chronology

• 1958-1959 The U.S. Government acquired property for the three Offutt Atlas D missile sites, according to later USACE documentation for the Offutt missile-site program.
• 1959 Construction began on the Offutt Atlas D missile-site program.
• 1959-1960 Construction of former Offutt Air Force Base Atlas "D" Missile Site 2 near Arlington occurred.
• 1960 Atlas D Site 549-B / former Site 2 was substantially completed as part of the Offutt Atlas D missile field.
• 1961-03-30 The Offutt Atlas D unit was operational, according to the Lincoln Air Force Base Legacy Project summary.
• 1961-04/1961-05 Atlas D Site 549-B was activated during April-May 1961.
• 1961-07-01 The 549th Strategic Missile Squadron designation was assigned to the Offutt Atlas D missile mission.
• 1962-10 During the Cuban Missile Crisis, the 549th SMS sites were placed at a high alert posture according to squadron-history sources.
• 1964-12-15 549-B was deactivated, and the 549th SMS was discontinued.
• 1966 USACE states that former Offutt Atlas D Missile Site 2 was declared excess.
• 1969 USACE states that the former missile site was transferred to private ownership.
• 2008 USACE hired ITSI Gilbane to begin remediation work for TCE-impacted groundwater at the former missile site.
• 2009-2010 Additional investigations identified a substantial TCE source area in soil and groundwater.
• 2011-2013 USACE and its contractor carried out award-recognized environmental restoration work at the former Site 2 source area.
• 2014-10-15 USACE reported the Arlington Atlas missile-site remediation project and associated Secretary of the Army Environmental Award.
• 2015-04-09 USACE published its fact sheet for Arlington, Nebraska, former Offutt AFB Atlas "D" Missile Site 2.

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