My Father was a SPC4 in the Army and was stationed at Ft Kagnew Station Ethiopia he was a jr. spook and shot both the M1 Garand and 45cal 1911 colt for expert. Me I joined the Airforce and the old modified M16's in basic(1980) fired .22 cal and jammed like crazy I qualified on it though. then in 1984 I had to shoot the M16 to go to Incirlick TU my orders just stated I had to shoot it (didn't need to qualify just fire it at little targets ) I hit it 40 some times just missed qualifying. Then when Desert Storm broke out the Air Force figured out we needed to learn to shoot again and I qualified on the M16 missed getting expert a couple of times but came close twice. Shooting once a year just doesn't get one very good at firing a weapon.
