There have been so many different combat knives used, to collect them all would take a lifetime. The combat troops, especially Special Ops types, often carry non-issue knives and other weapons. Here are a few issue and non-issue combat knives from the recent past.
These Kutmasters were made on the same assembly line as the M-1 Garand bayonets. These are very rugged knives.

Another popular combat knife was issued to the 82nd and 101st Airborne in WWII. It is the M3, bacically the m-1 Carbine bayonet without the ring and pommel attachment. This one was made by Camillus. The Viet Nam era bayonets for the M16A1 had an identical blade with fiberglass handles.

Here is a current issue Ontario combat knife, patterned after the famous Marine Combat or Mk 2. These were also made by Ka-Bar, Camillus, and others.

The Studies and Observatios Group, MACV, had some fighters made for them in Japan. SOG did recon along the Ho Chi Minh trail in Laos. It was a joint service covert operations group. Heavy Hook 3 operated from my base (56th Special Ops Wing, USAF). The Army ground guys from my base were all 5th Special Forces Group. The knife company, SOG, took its name from SOG-MACV. This is not an original. I carried a Camillus, but I wasn't a Green Beret, either!


Here is a Camillus pilots survival knife, which was also popular with many recon units.

This is the current issue Gerber LMF II.

As you can see, none of these knives matches those from the Busse Knife Group that are being carried mostly by combat and special ops guys today.