[Pete]

Carried a K-bar, USN Mk 2 Fiberglass sheath version, on the LBE and a Swiss Army Knife in a small nylon sheath on my pants belt.

Stashed somewhere on the rucksack was a Leatherman in a leather sheath.

I would say at that time period the K-bar with Leather sheath was carried by most guys that I hung with. Officers and single barracks rats could fund the purchase of a higher quality knife but the common folks never cried over a lost or broken K-Bar.

I think the only time the bayonets came out of the arms room was for parades, and darn few of those.

Edited to add. The SFUWO Course at Key West used the K-Bar as the Dive Tool in the 70s. The sheath was a piece of heavy fire hose and rubber band. Kept them greased and they worked fine.