PGU-20 25mm ammunition
In the past, the Navy used the 25 mm PGU-20 round but has phased it out of use. The U.S. Marines developed the GAU-12 air-to-surface gun system for the AV-8B Harrier Close Air Support System. This six-barreled 25mm gun pod was designed to be centerline mounted. The AV-8B Harrier aircraft deployed to the Gulf flew 3,342 sorties. A typical combat load would include 300 rounds of 25mm with an equal mix of DU and high expolsive rounds. The average turnaround time for flight operations during the ground war was 23 minutes.
The U.S. Marines fired 25mm PGU-20 munitions, each having a 150-gram DU penetrator slug
from the GAU-12 Gatling gun center mounted on the AV-8B. The Marines fired 67,436 (PGU-20) 25mm DU in the Gulf War. This relates to about 20 DU rounds per sortie. Therefore, it is estimated that the U.S. Marines expended about 11 tons of DU during the Gulf War. The PGU-20 round has about 3 percent of the mass of an M829A1 120mm round. Therefore, it would take about 31 PGU-20 25mm rounds to equal the mass of DU in an M829A1 round.
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