490th Missile Squadron, Strategic missile squadron at Malmstrom Air Force Base, Montana, US.

The 490th Missile Squadron is a military unit stationed at Malmstrom Air Force Base in Montana that operates and maintains Minuteman III intercontinental ballistic missiles. These weapons systems are distributed across multiple launch facilities spread throughout central Montana.

The 490th Bombardment Squadron was activated at Camp Malir, India (now Pakistan), on 15 September 1942, drawing its cadre from the 11th Bombardment Squadron. Flying B-25 Mitchells from Ondal and later Kurmitola, it attacked rail lines, marshalling yards and bridges in Burma. Its "Glip" glide-skip bombing earned it the nickname "Burma Bridge Busters" and a Distinguished Unit Citation for operations between October and December 1944. It was inactivated at Camp Kilmer, New Jersey, on 2 November 1945.

The nickname "Burma Bridge Busters" came from the Glip (GLide-skIP) technique, in which B-25s approached a bridge in a slight dive along the rail line and released the bomb as the aircraft pulled up. Developed by the 490th in early 1944, the method improved bridge-attack accuracy and spread to the rest of the 341st Group.

The unit operates under strict security protocols and only authorized personnel can access the base. The facility is not open to visitors since it remains an active military installation housing critical nuclear weapons systems.

The squadron's World War II bridge-bombing method, called "Glip" (for GLide-skIP), had B-25 Mitchells approach a bridge in a slight dive along the rail line and release the bomb as the aircraft pulled up. The tactic improved accuracy and spread to the rest of the 341st Bombardment Group.