All those bring back memories. Thompsons and BARs were readily available in Viet Nam. I kept a Bridgeport M1A1on my tank as a personal weapon. Upon DEROS it went to a friend in another unit. The M1919 is a veritable treasure!! The M48A3 tank came with the incredibly unreliable M73 machine gun. My solution was to reverse the modifications made to the turret and gun mount and reinstall the .30 caliber Browning. We would get asked what we did to make our coax work so well. The BAR is the granddaddy of the M240 that US tankers finally got in the mid-eighties, although most GIs do not know that.