Former Komatsu Naval Air Base Revetment

Komatsu naval airfield was built for the Imperial Japanese Navy's Maizuru Naval District on the coast of Komatsu City, Ishikawa Prefecture: land was acquired from 1941, construction began on April 1, 1943, and the runways were completed on November 15, 1944. In the last year of the war, as air raids intensified against Pacific-facing bases, the Navy moved training and operational units to the relatively safer Sea of Japan coast. Two intersecting runways were constructed — 1,500 m east-west and 1,700 m north-south, each 100 m wide — in a cross configuration to accommodate aircraft vulnerable to crosswinds.

The base housed the Komatsu Naval Aviation Squadron, focused on land-based attack aircraft training, along with two naval attack squadrons. Approximately 6,000 naval trainees and personnel were stationed in the Komatsu area. The installation was also associated with the feared Shinrai Unit (神雷部隊, Divine Thunder Corps), which operated Yokosuka MXY-7 Ohka rocket-powered kamikaze glide bombs from various bases.

To protect aircraft from Allied air attacks, a substantial network of hardened shelters was constructed around the airfield. The original complement included 35 medium covered revetments, 40 medium open revetments, 31 small covered revetments, and 15 small concealed positions — over 120 dispersal points in total. These reinforced concrete structures were built so solidly that postwar demolition attempts by local residents using heavy excavators proved futile; the concrete simply could not be broken.

The war ended before Komatsu suffered the devastating air raids that destroyed many other Japanese airfields. After Japan's surrender in August 1945, U.S. forces requisitioned the base as an auxiliary radar facility. The Americans returned the site in 1958, and the Japan Air Self-Defense Force established Komatsu Air Base in 1961, with Komatsu Airport opening to civil aviation on the shared runway in December 1961.

Today, very few of the original 120+ wartime shelters survive. The most significant is the Old Aircraft Revetment (旧掩体壕), officially preserved by the JASDF within the base grounds near the southern end of the former runway. This covered reinforced concrete shelter displays the characteristic naval-specification design: a curved arch profile with separated front and rear sections, though the Komatsu example appears truncated — possibly indicating incomplete wartime construction or postwar partial demolition of the front section. The JASDF has placed a T-6G intermediate trainer aircraft inside, painted in wartime camouflage colors to commemorate the base's naval aviation heritage.

Outside the base perimeter, scattered remnants include a wartime power generation facility (reinforced concrete, now used for vehicle storage behind the Ukiyanagi post office area), ammunition storage structures (some converted to residential use), and a brick warehouse near the runway area. In the adjacent Ataka Forest, pine trees still bear resin-extraction scars from wartime resource mobilization, when pine oil was desperately collected as aviation fuel substitute.

The nearby Ishikawa Aviation Plaza (石川県立航空プラザ), opened in 1995 adjacent to Komatsu Airport, is the only aviation museum on the Sea of Japan coast. While focused primarily on postwar JASDF aircraft (F-104J, T-33A, T-2 Blue Impulse), its 17 exhibited aircraft and flight simulators provide broader aviation historical context. The JASDF base itself offers monthly guided tours (by lottery reservation, ~20 visitors) that include the preserved revetment.

Komatsu's wartime legacy represents an important chapter in Japan's late-war defensive dispersal strategy — the desperate attempt to preserve airpower by scattering assets along the less-vulnerable Sea of Japan coastline as the Pacific coast burned.