Frank, At that time, 1957, the Marine Corps did not use either the carbine or Thompson. The 13 man Squad in the group picture consists of 3 Fire Teams and a Squad Leader who carries a M1rifle. Each Fire Team consists of 4 men, a Fire Team Leader (M1 Rifle), Automatic Rifleman (BAR), Assistant Automatic Rifleman (M1 Rifle) and Rifleman (M1 Rifle). That is how they are in formation. Not counting the umpires, the first row is the Squad Leader, Fire Team Leader, BAR man, Asst BAR man and the Rifleman. Next two rows are lined up the same so the BAR men are in a line, front to rear. You should only see 10 M1 rifles and 3 BAR's in the group photo. The other photo is also a squad and you would only see BAR's and M1 rifles. Not the clearest pictures to identify some of the weapons.
I was stationed at Camp Lejeune in the 2nd Mar. Div. at that time but in the 10th Marines, which was Artillery. I didn't know anyone in those pictures. They are from a 1957 edition of Leathneck Magazine.