Just to add my 2 cents to this thread:
USMC Rifle Company TO&E Vietnam:
Company HQ: 1 x Capt., 1 x 1st Lt., 1 x GySgt., 2 x Radiomen, 2 x Riflemen
(Runners), all with M-14/M-16, 2 x Corpsmen.
Rifle Platoon (x 3):
Platoon HQ: 1 x 2nd Lt., 1 x Plt. Sgt., 1 x Plt. Guide (Runner), 1 x Radioman, all with
M-14/M-16, 2 x Corpsmen.
Rifle Squad (x 3):
1 x Sqd. Ldr., 3 x Team Ldr., 6 x Riflemen, 3 x Auto-Riflemen, all with M-14/M-16,
1 x Grenadier with M-79. Auto-Rifle was a modified M-14 w/selector switch and bipod.
Some units kept them 'til way late in the war.
Weapons Platoon (x1):
Platoon HQ: 1 x 2nd Lt., 1 x Plt. Sgt., 1 x Radioman, 1 x Mortar FO w/radio (Bn. Net),
all with M-14/M-16, 1 x Corpman.
Mortar Section:
1 x Section Ldr., 3 x M-29 81mm mortars, each w/4 crew, all with M-14/M-16
(most also carried M-1911A1).
Anti-Tank Section:
1 x Section Ldr., 3 x Sqd. Ldr, 6 x M-20 3.5" Bazooka or 6 x M-67 90mm RR, each
w/3 crew, all with M-14/M-16 (gunners also carried M-1911A1). M-72 LAW
started replacing 3.5" & 90mm RR in 1969.
Machine Gun Section:
1 x Section Ldr., 3 x Sqd. Ldr., 6 x M-60 MMG, each w/3 crew, gunners carried
M-1911A1, all others M-14/M-16
Notes:
1. This is a 100% strength TO&E. We all know about combat losses and weapon malfunction. Like reality, it won't last long.
2. I used several sources to compile this, starting with my own library (and what is left of my memory). Even found my
Guidebook for Marines (Pub. 1968). One surprising source was
http://www.gruntonline.com/index.htm This is a pretty good site about Vietnam. Worth a look.
3. The M-14 was used until 1968, when the M-16 was issued. Some units kept their auto M-14's for additional firepower.
Semper Fi!