BTW, in 1975, our first A-10s and F-15s were being delivered to the combat wings. Imagine them over the concentrated columns of armor of the North Vietnamese forces! F-15s on top flying CAP against MIGs, with A-10s raking T-72s and BMPs with 20MM depleted shells from their Volkswagen-sized gatling guns!
Duh!!! 30MM gatling gun!!!!!!