In Army basic training and infantry AIT (1968) we trained on the M14 rifle, with a brief familiarization on the M16. Apparently the transition had not been completed by that time, or perhaps the new M16's were going out to combat units first before training outfits received deliveries.
Use of the rifle was heavily emphasized, with some very good instruction on some of the finer points. We learned how to use the "shooting sling" at prone, sitting, kneeling, and offhand positions, and I became a believer in that. I took the post rifle trophy during basic training with a perfect score (M14), qualified as expert with every infantry weapon from the pistol to the M2 .50BMG, and was later selected for the US Army Marksmanship Training Unit where I competed with both service rifle and pistol.
In Vietnam I learned to appreciate the M16 due to its lighter weight, and much lighter ammunition, which mean a lot to infantrymen in the field. I was never greatly impressed with the M16's accuracy, particularly at extended ranges, but found it to be generally serviceable (if properly maintained and lubricated correctly). I always used the sling for shooting, kept mine clearly marked at the point where it was properly adjusted for the "shooting sling" method.
Equipment noise in the field was dealt with using duct tape or electrical tape on everything that might jingle, jangle, or clink. Sling swivels, pack straps, LBE gear, everything was cinched down and taped up. It is just about impossible for a group of men to move through the bush without making any noise, but we limited it in every way we could.
To this day when I am firing a rifle, at the range or in the field, I continue to use the shooting sling. The added stability, with or without a rest, can make a big difference.
