An interesting book for sure. Ol' Roy was certainly opinionated. He was in Ordnance early enough to see the teething troubles of the Garand and was then of the opinion that the infantry would have been better off with a militarized Model 70.
From contact in North Africa, he said everybody liked the Beretta SMGs, the Italians, the Germans, the British, the Americans, and the Arabs. He thought the Beretta .380 was a suitable sidearm, the hard kicking .45 unnecessary.
In the PTO he thought the rate reducer on a BAR 1918 A2 was the source of most of its troubles, clogging up with water and jungle duff. He said you would be better off to find an earlier gun with simple semi-full selector.