Production. A-20 attack bombers. Mechanics on the flight ramp on the Douglas Aircraft Company at Long Beach, California, check final adjustments on an A-20 attack bomber just before delivery to the Army. The A-20 is used by the American Air Force and Royal Air Force (RAF) for hedge hopping and strafing operations against ground troops and installations--also for reconnaissance work and night fighting. It is armed with light and heavy caliber guns