Historic California Posts, Camp, Stations and Airfields
Los Angeles Defense Area Site LA-96
(Sepulveda Air National Guard Station)
The United states Army acquired a total of 40.69 acres of land called Los Angeles Defense Area Site LA-96. On 11 April 1962, the Army acquired 29 acres of this land by use permit from the Army (Civil). An additional 0.04 acre railroad crossing easement was acquired by license from the Southern Pacific Company. Another 10.36 acres in a geographically separate location were acquired by declaration of taking from the Garden Land Company. A 1.29 acre parcel was also leased from Garden Land Company.

The land was used for construction, operation, and maintenance of the Nike-Ajax and later , the Mike Hercules air defense missile systems. The first location, consisting of 29 acres, was referred to as the Administrative and Launcher Area, also known respectively as LA-96A and LA-96L. The second location, consisting of 11.65 acres, was known as the Integrated Fire Control Area (LA-96C).

On 20 August 1970, the Army returned 11.39 of the 29 acres acquired by use permit from the Commander General, Sixth US Army, to the Department of the Army (Civil). The Air National Guard leased the remaining 17.65 acres area from the Army including the 0.04 acre easement for use as the Sepulveda Air National Guard Station for the 261st Combat Communications
Squadron. These 17.65 acres are located on Victory Boulevard between Haskell and Woodley Avenues.
The Control Area's 11.65 acres were divided into three sections and disposed of as follows. On 26 June 1969, the Army reported 10.36 acres excess to the General Services Administration (GSA). The GSA transferred the first 8.0 acres to the Department of the Interior, who then conveyed them to the City of Los Angeles on 3 November 1972 comprising what is now known as San Vincente Mountain Park. The second section of 2.36 acres were transferred by the GSA to the U. S. Department of Commerce's National Oceanic and Atmosphere Administration (NOAA). No further information is available regarding NOAA. On 31 October 1965, the third section, consisting of 1.29 acres was returned to Garden Land Company when the lease expired.
Source: Los Angeles District, US Army Corps of Engineers, History compiled in 1999.
Army units that have garrisoned site were:
Sepulveda Air National Guard Station
The 261st Combat Communications Squadron came to Sepulveda Air National Guard Station on 15 June 1973. The squadron was subordinate to the 162nd Communications Group at the North Highlands Air National Guard Station. Originally with 177 personnel assigned to operate and maintain radio communication systems around under the direction of the Governor of California and the President of the United States. The missions and the size of the squadron changed over the years. Members supported operations around the world like DESERT STORM, COBRA GOLD and NOBLE EAGLE. State missions for forest fires, drug enforcement and New Orleans after Hurricane Katrina hit. The squadron deployed several times a year to remote sites in California. The station came under Space Command, 24th Air Force on 22 October 2009 as part of a new Cyber-space and intelligence mission. The 24th Air Force is headquartered at Lackland AFB,Texas. In early 2014 the 261st Combat Communications Squadron converted to the 261st Network Warfare Squadron under the Network Warfare Group in San Antonio, Texas
Posted 15 February 2015
Nike-Ajax (left) and Nike-Hercules (right Missiles (NARA)

The Western Electric SAM-A-7/M1/MIM-3 Nike Ajax

The Nike Ajax was the world's first operational surface-to-air guided missile system. Its origins lay in the immediate post-war time, when the U.S. Army realized that guided missiles were the only way to provide air-defense against future fast high-flying bombers. Western Electric became the prime contractor for the XSAM-G-7 Nike missile system and Douglas as the primary subcontractor was responsible for the missile airframe.

The first unguided Nike missiles were fired in 1946, but problems with the original multi-rocket booster (eight solid-fuel rockets wrapped around the missile tail) soon led to delays in the program. In 1948, it was decided to replace this booster pack with a single rocket booster, attached to the back of the missile. The main propulsion of the missile was a Bell liquid-fueled rocket motor, and the flight path was controlled by the four small fins around the nose. In November 1951, the first successful interception of a QB-17 target drone succeeded. The first production Nike (which had been redesignated SAM-A-7 in 1951) flew in 1952, and the first operational Nike site was activated in 1954. By this time, the missile had been designated by the Army as Guided Missile, Anti-Aircraft M1. The name had changed to Nike I, to distinguish it from the Nike-B (later MIM-14 Nike Hercules) and Nike II (later LIM-49 Nike Zeus). On 15 November 1956, the name was finally changed to Nike Ajax.

The Nike Ajax missile used a command guidance system. An acquisition radar called LOPAR (Low-Power Acquisition Radar) picked up potential targets at long range, and the information on hostile targets was then transferred to the Target Tracking Radar (TTR). An adjacent Missile Tracking Radar (MTR) tracked the flight path of the Nike Ajax missile. Using tracking data of the TTR and MTR, a computer calculated the interception trajectory, and sent appropriate course correction commands to the missile. The three high-explosive fragmentation warheads of the missile (in nose, center, and aft section) were detonated by ground command, when the paths of target and missile met.

One of the major disadvantages of the Nike Ajax system was that the guidance system could handle only one target at a time. Additionally, there was originally no data link between different Nike Ajax sites, which could lead to several sites engaging the same target. The latter problem was eventually solved by the introduction of the Martin AN/FSG-1 Missile Master command-and-control system, with automatic data communication and processing. Other problematic features of the Nike Ajax system were the liquid-fuel rocket motor with its highly toxic propellants, and the large size of a complete site with all components, which made Nike Ajax to all intents and purposes a fixed-site air defense system.

By 1958, nearly 200 Nike Ajax sites had been activated in the United States. However, the far more advanced MIM-14 Nike Hercules soon replaced the Nike Ajax, and by late 1963, the last Nike Ajax on U.S. soil had been retired. In 1963, the Nike Ajax had received the new designation MIM-3A. Despite the use of an MIM (Mobile Intercept Missile) designator, the mobility of the Nike Ajax system was more theoretical than actually feasible in a combat situation.

The MIM-3A continued to serve with U.S. overseas and friendly forces for many more years. In total, more than 16,000 missiles were built.
Western Electric SAM-A-25/M6/MIM-14 Nike Hercules

The Nike Hercules was the only nuclear-armed surface-to-air weapon, which was operational with the U.S. Army. Development of an improved Nike missile began in 1952, with the primary goal to develop a missile with a significantly higher performance than MIM-3 Nike Ajax (then known simply as Nike), which could still be used with the existing Nike ground equipment. After it had been shown that the Nike Ajax could not be equipped with then existing nuclear warheads, nuclear armament became another goal for the new missile. The SAM-A-25 Nike B program was formally established in June 1953. As with Nike Ajax, Western Electric was prime contractor, and Douglas was responsible for the missile airframe.

The Nike B (renamed Nike Hercules on 15 December 1956) used many components of the Nike I (Nike Ajax). The booster consisted of four Nike Ajax boosters, and the original design used 4 of Ajax' liquid-fuel rockets as sustainer propulsion. However, the first flight tests with the liquid-fuel sustainer in 1955 proved very troublesome, and a solid-fueled sustainer rocket was eventually used. The first successful interception of a drone target occurred in 1956, and in 1957 the new solid-fuel sustainer flew for the first time. Nike Hercules used the same command guidance as the MIM-3 Nike Ajax, with essentially the same ground components.

The first production Nike Hercules missiles were delivered in 1958, and quickly replaced the Ajax on many Nike sites. By then, the Nike Hercules had been designated as Guided Missile, Air Defense M6. The M6 could be equipped with either an M17 (a.k.a. T45) blast-fragmentation warhead, or a W-31 nuclear fission warhead with yield selectable as 2 kT or 40 kT. The missile performance was such that even very high-flying bombers could not escape the Nike Hercules. Capability against low-level targets remained rather limited, however.

As the Nike Hercules began replacing the older Nike Ajax, work was underway to improve the acquisition and tracking radar capabilities to fully exploit the missile's greater performance. The major improvement in what was called the Improved Hercules system was the new L-band acquisition radar, called HIPAR (High-Power Acquisition Radar). The TTR (Target Tracking Radar) and TRR (Target Ranging Radar) were also improved, having better ECM resistance. The missiles of the improved Improved Hercules system were designated as M6A1. In June 1960, an Improved Hercules achieved the world's first successful interception of a ballistic guided missile, when a MGM-5 Corporal SRBM was shot down. The new radars were also far more compact than the original ones, which made moving a Nike site a least somewhat practical for the first time. Lastly, Improved Hercules introduced a viable surface-to-surface capability to the Nike system. The first Improved Hercules systems were installed at Nike sites in June 1961.

In 1963, the M6 and M6A1 missiles were redesignated as MIM-14A and MIM-14B, respectively. The MIM-14C (introduced in 1972) was a modified MIM-14B with an improved missile guidance section for higher maneuverability and better ECM resistance.

All in all, the U.S. Army established 145 Nike Hercules sites over the years. Production of the nuclear-armed missiles ended in 1964, and gradual phase-out of the MIM-14 began in the late 1960's. The Army originally planned to replace the Nike with the new MIM-104 Patriot missile, but this plan was not implemented in the USA. Therefore, after the last active Nike Hercules sites in the continental U.S. had been deactivated in 1974, there are no long-range air-defense missiles fielded in the U.S.. In Europe, the U.S. Army retired its last MIM-14 units in 1984, when the MIM-104 Patriot was introduced.

In total, more than 25000 Nike Hercules missiles of all versions were produced, most being of the MIM-14B variant.

Source: Directory of U.S. Missiles and Rockets, http://www.designation-systems.net/

Search our Site!
Search the Web Search California Military History Online
Questions and comments concerning this site should be directed to the Webmaster
Updated 8 February 2016