NAVAL AIR FACILITY ATSUGI

OVERVIEW

Naval Air Facility Atsugi is the United States Navy's principal rotary-wing air station in Japan and the helicopter beach detachment of the only permanently forward-deployed U.S. carrier air wing. The base sits on the Sagami Plain in Kanagawa Prefecture, straddling the cities of Ayase and Yamato, about 30 km southwest of central Tokyo and 25 km north of Naval Station Yokosuka — close enough that aircraft regularly transit between the two installations.

NAF Atsugi is a joint airfield, shared with the Japan Maritime Self-Defense Force's Fleet Air Wing 4, which operates P-1 maritime patrol aircraft from the eastern side of the runway. On the U.S. side, the base hosts the helicopter squadrons of Carrier Air Wing 5 — Helicopter Maritime Strike Squadron 51 (HSM-51 "Warlords") flying MH-60R Seahawks and Helicopter Sea Combat Squadron 12 (HSC-12 "Golden Falcons") flying MH-60S — along with the C-2A Greyhound carrier onboard delivery detachment of VRC-30. Approximately 6,500 U.S. service members, civilians, and family members are assigned to the base.

The facility's strategic value comes from its proximity to the forward-deployed aircraft carrier homeported at Yokosuka. Atsugi-based helicopters embark for every CSG 5 deployment, and the airfield provides a maintenance, training, and contingency-recovery base for the air wing throughout the year.

KEY FACTS

• Joint AirfieldShared with Japan Maritime Self-Defense Force Fleet Air Wing 4 — busiest U.S. military airfield in the Pacific by movements until 2018
• Helo HubBeach detachment for the forward-deployed Carrier Air Wing 5 — homeport of the air wing's helicopter squadrons (HSM-51, HSC-12)
• CVW-5 HeritageHosted Carrier Air Wing 5's fixed-wing F/A-18 squadrons until their 2017–2018 relocation to MCAS Iwakuni
• P-8A Operating SiteForward operating site for U.S. and allied P-8A Poseidon maritime patrol detachments
• Tokyo Metro AreaLocated on the Sagami Plain about 30 km southwest of central Tokyo and 25 km north of Yokosuka

HISTORY

Atsugi began as an Imperial Japanese Navy airfield in 1938, built on flat farmland on the Sagami Plain to provide air defense for Tokyo and the Yokosuka naval base 25 km to the southeast. By the early Pacific war, Atsugi was a major fighter and night-fighter base and the home of the 302nd Naval Air Group, equipped with J1N1 "Gekko" interceptors and later J7W1 "Shinden" prototypes. In the closing weeks of World War II the 302nd's commander led an unsuccessful mutiny against the Emperor's surrender broadcast, leaving the airfield in a chaotic state when Allied forces arrived.

On August 30, 1945, General Douglas MacArthur landed at Atsugi aboard a C-54 named Bataan to begin the Allied occupation of Japan — the first significant Allied landing on the Japanese home islands. Atsugi served as the principal point of entry for U.S. forces during the early occupation. The airfield was largely deactivated in the late 1940s and used as a temporary CIA and Air Force facility before the U.S. Navy reactivated it as Naval Air Facility Atsugi on December 1, 1950, in support of carrier air operations during the Korean War.

Through the 1950s and 1960s, Atsugi hosted a variety of patrol, transport, and detachment squadrons, including reconnaissance units operating U-2 aircraft from the base in the late 1950s and early 1960s. The base's modern role began on October 5, 1973, when USS Midway and Carrier Air Wing 5 became the first permanently forward-deployed U.S. carrier and air wing — homeporting the carrier at Yokosuka and basing the air wing's fixed-wing and rotary squadrons at Atsugi. CVW-5 has remained the only forward-deployed U.S. carrier air wing ever since, transitioning through F-4 Phantoms, A-6 Intruders, A-7 Corsairs, F-14 Tomcats, F/A-18 Hornets, and F/A-18E/F Super Hornets.

For decades the noise of the air wing's day and night operations made NAF Atsugi the busiest and most contentious U.S. military airfield in Japan. Beginning in 2007, the U.S. and Japanese governments agreed under the Defense Policy Review Initiative to relocate CVW-5's fixed-wing squadrons — five F/A-18E/F squadrons and one EA-18G squadron — to Marine Corps Air Station Iwakuni in southwestern Honshu. The transfer began in 2017 and was completed in 2018, dramatically reducing the noise footprint over the densely populated Sagami Plain. NAF Atsugi retained the air wing's helicopter squadrons (HSM-51 and HSC-12), the VRC-30 C-2A detachment, and the rotational P-8A Poseidon detachments operating under Commander, Task Force 72 — the 7th Fleet's patrol and reconnaissance command. Today Atsugi is a quieter but still operationally critical helicopter and patrol airfield, supporting every deployment of the forward-deployed carrier strike group and providing a transit and recovery base for U.S. and allied maritime patrol aircraft across the Western Pacific.

MAJOR COMMANDS & TENANT UNITS

• Commander, Naval Air Facility Atsugi (CNAF Atsugi)
• Commander, Task Force 72 (Patrol and Reconnaissance Forces, 7th Fleet)
• Helicopter Maritime Strike Squadron (HSM) 51 — "Warlords"
• Helicopter Sea Combat Squadron (HSC) 12 — "Golden Falcons"
• Fleet Logistics Support Squadron (VRC) 30 Detachment 5 — "Providers"
• Naval Air Maintenance Training Group Detachment Atsugi
• Japan Maritime Self-Defense Force Fleet Air Wing 4 (joint tenant)

LOCATION & GEOGRAPHY

HOST NATION CONTEXT

NAF Atsugi operates under the U.S.–Japan Treaty of Mutual Cooperation and Security (1960) and the bilateral Status of Forces Agreement of the same year. As a joint U.S.–JMSDF airfield, day-to-day operations involve continuous coordination with the Japan Maritime Self-Defense Force's Fleet Air Wing 4 commander and with Kanagawa Prefecture authorities through the Defense Bureau of the Japanese Ministry of Defense.

Approximately 1,000 Japanese employees work on the U.S. side of the base under the Master Labor Contract program. The Japanese government provides Host Nation Support funding under the bilateral Special Measures Agreement, helping cover utility, labor, and facility costs. Local noise abatement procedures are negotiated with the cities of Ayase, Yamato, and Sagamihara and remain politically sensitive — particularly in advance of carrier air wing fleet carrier qualification periods.

U.S. military personnel and SOFA-status family members enter Japan with no-fee passports and a SOFA stamp; civilian visitors require a standard Japanese visa or visa waiver and must be sponsored for base access. Liberty in the Tokyo–Yokohama metropolitan area is permitted under standing 7th Fleet liberty policy.

NOTABLE EVENTS

1. 1938
   Imperial Japanese Navy Airfield

   Imperial Japanese Navy opens Atsugi Air Base as a defensive interceptor field protecting Tokyo and Yokosuka.
2. 1945
   MacArthur Arrival

   On August 30, 1945, General Douglas MacArthur arrives at Atsugi to begin the Allied occupation of Japan — the first Allied landing on the Japanese home islands.
3. 1950
   U.S. Navy Reactivation

   After interim Allied use, the airfield is reactivated as Naval Air Facility Atsugi to support carrier air wing operations during the Korean War.
4. 1973
   Forward-Deployed Air Wing

   With USS Midway homeporting at Yokosuka, Carrier Air Wing 5 is established at Atsugi as the U.S. Navy's only permanently forward-deployed carrier air wing.
5. 2017
   Fixed-Wing Departure

   The fixed-wing F/A-18 and EA-18G squadrons of CVW-5 begin relocating from Atsugi to MCAS Iwakuni, completing the move in 2018 — Atsugi retains the air wing's helicopter squadrons.

NEARBY BASES

FREQUENTLY ASKED QUESTIONS

SOURCES

• Wikipedia: Naval Air Facility Atsugi
• CNIC — Naval Air Facility Atsugi
• U.S. 7th Fleet — CTF 72
• U.S. Department of State — U.S.–Japan Relations