The squadron was first activated at Drane Field in the spring of 1944 as the 4th Fighter Reconnaissance Squadron, one of the original squadrons of the 3d Air Commando Group.
 After training in Florida until October, the squadron shipped overseas to the Philippines as the 4th Fighter Squadron, Commando.
 Under Fifth Air Force, it attacked Japanese airfields, railways and other targets in the Philippines and Taiwan and supported ground forces in the Philippines.
 The unit flew escort missions for attacks on Taiwan and the Chinese coast and provided top cover for ship convoys.
 For its actions in the liberation of the Philippines the squadron was awarded a Philippine Republic Presidential Unit Citation.

In August 1945 the squadron moved to Ie Shima and flew a few patrols over Japan before the surrender of Japan.
 It moved to Chitose Airfield and served with the occupation forces until inactivating in March 1946.
The squadron was disbanded in October 1948 while inactive.
The squadron was first activated at Drane Field in the spring of 1944 as the 4th Fighter Reconnaissance Squadron, one of the original squadrons of the 3d Air Commando Group.  After training in Florida until October, the squadron shipped overseas to the Philippines as the 4th Fighter Squadron, Commando.  Under Fifth Air Force, it attacked Japanese airfields, railways and other targets in the Philippines and Taiwan and supported ground forces in the Philippines.  The unit flew escort missions for attacks on Taiwan and the Chinese coast and provided top cover for ship convoys.  For its actions in the liberation of the Philippines the squadron was awarded a Philippine Republic Presidential Unit Citation.
In August 1945 the squadron moved to Ie Shima and flew a few patrols over Japan before the surrender of Japan.  It moved to Chitose Airfield and served with the occupation forces until inactivating in March 1946. The squadron was disbanded in October 1948 while inactive.
604th Special Operations Squadron