This report, the first in a two volume set, describes firings of the A-10/GAU-8 weapon system on 15 June 1978, against a Soviet tank company simulated by ten combat loaded M-47 tanks. The pilots making the firing passes attacked at low altitude and corresponding low dive angles simulating movement through a hostile air defense system. Ammunition used in the attacks comprised 30mm armor piercing incendiary rounds, which proved to be effective damage agents against substantial areas of the U.S. M-47 tanks used as targets. The pilots in 23 firing passes achieved 347 impacts on the ten target tanks. The impacts included 50 perforations of the armored envelopes and resulted in damage comprising six tanks catastrophically killed, three tanks incapable of fire and movement, and one tank with degraded mobility.