The squadron was activated on 1 April 1943 at the Army Air Force School of Applied Tactics, Orlando AAF, Florida.
  After several months of training with Douglas P-70 Havoc night fighters, the unit was deployed to the Pacific Theater,  moving first to Camp Patrick Henry, near Newport News Virginia where they boarded the USS General John Pope, sailing through the Panama Canal to Milne Bay, New Guinea.

In New Guinea, the squadron was assigned to Fifth Air Force and initially stationed at Dobodura airfield in November 1943.
 It was the first dedicated night interceptor squadron assigned to the Pacific Theater.
  However, it was found that the P-70 was not very successful in actual combat interception of Japanese fighters at night and after a short time, Fifth Air Force modified some Lockheed P-38F Lightnings in the field as single-seat night fighters by fitting an SCR540 radar with yagi antennae on the nose on both sides of the central nacelle, and above and below the wings.
 The Lightnings were much more successful than the P-70s, and Lockheed sent field representatives to new Guinea to study the modified aircraft for a new production model (P-38M) which it began producing in 1944.

As the fortunes of war progressed, the squadron moved west along the northern coast of New Guinea, moving to several advance airfields on the island throughout 1943 and 1944.
  In September 1944, the squadron was re-equipped with P-61 Black Widows and moved to Morotai Island in the Dutch East Indies where they engaged enemy aircraft.
   In the East Indies, additional B-25 Mitchells and P-38s were assigned, using the B-25s for night intruder operations, P-61s for night fighter operations and the P-38s for searchlight cooperation operations.
  In November the squadron moved to the Philippines, arriving on Leyte on 14 November.

The unit was attached frequently to different units throughout the war, and remained in the Philippines until July 1945 when it moved to Okinawa.
  From Kadena Airfield, the unit attacked a wide range of enemy targets on Hainan Island, Hong Kong, and along the east China coast.
  Its first mission against targets on the Japanese Home Islands took place on 28 July when it attacked targets on Kyūshū and also in the Shanghai area of enemy-controlled China.

After V-J Day, the 418th NFS moved briefly to Atsugi Airfield, Japan during October 1945 where it was part of the occupying forces.
  It returned to Okinawa on 15 June 1946, conducting training operations until 20 February 1947 when the unit was inactivated.
  Its assigned personnel, aircraft and equipment were transferred to the 4th Fighter Squadron (All Weather).
The squadron was activated on 1 April 1943 at the Army Air Force School of Applied Tactics, Orlando AAF, Florida.   After several months of training with Douglas P-70 Havoc night fighters, the unit was deployed to the Pacific Theater,  moving first to Camp Patrick Henry, near Newport News Virginia where they boarded the USS General John Pope, sailing through the Panama Canal to Milne Bay, New Guinea.
In New Guinea, the squadron was assigned to Fifth Air Force and initially stationed at Dobodura airfield in November 1943.  It was the first dedicated night interceptor squadron assigned to the Pacific Theater.   However, it was found that the P-70 was not very successful in actual combat interception of Japanese fighters at night and after a short time, Fifth Air Force modified some Lockheed P-38F Lightnings in the field as single-seat night fighters by fitting an SCR540 radar with yagi antennae on the nose on both sides of the central nacelle, and above and below the wings.  The Lightnings were much more successful than the P-70s, and Lockheed sent field representatives to new Guinea to study the modified aircraft for a new production model (P-38M) which it began producing in 1944.
As the fortunes of war progressed, the squadron moved west along the northern coast of New Guinea, moving to several advance airfields on the island throughout 1943 and 1944.   In September 1944, the squadron was re-equipped with P-61 Black Widows and moved to Morotai Island in the Dutch East Indies where they engaged enemy aircraft.    In the East Indies, additional B-25 Mitchells and P-38s were assigned, using the B-25s for night intruder operations, P-61s for night fighter operations and the P-38s for searchlight cooperation operations.   In November the squadron moved to the Philippines, arriving on Leyte on 14 November.
The unit was attached frequently to different units throughout the war, and remained in the Philippines until July 1945 when it moved to Okinawa.   From Kadena Airfield, the unit attacked a wide range of enemy targets on Hainan Island, Hong Kong, and along the east China coast.   Its first mission against targets on the Japanese Home Islands took place on 28 July when it attacked targets on Kyūshū and also in the Shanghai area of enemy-controlled China.
After V-J Day, the 418th NFS moved briefly to Atsugi Airfield, Japan during October 1945 where it was part of the occupying forces.   It returned to Okinawa on 15 June 1946, conducting training operations until 20 February 1947 when the unit was inactivated.   Its assigned personnel, aircraft and equipment were transferred to the 4th Fighter Squadron (All Weather).
418th Tactical Fighter Training Squadron