Back in the late 70's in the Army, If you couldn't afford a Randall like the guys who were very serious about their blades, you likely carried some type of Gerber fixed blade......Mark 1's and 2's were popular. You could clip the Mark 1 to the shoulder strap of your web gear. You would also see some standard Buck, Browning, etc. hunting knives. The most common knife was the little Army silver metal handled "boy scout" type knife. In the 80's, you probably saw some Al Mars, the ugly Buck "Rambo" looking knives and early SOG's and the like showing up, but not much in regular units. That was what was in the display case at places like Ranger Joe's and in the Cav Store catalog. I never saw any customs other than Randalls and most of those were bought from Cumberland Knife and Gun Works in Fayettenam by SF guys. The Moran and Loveless types and even the Randalls that folks carried in Veitnam had become too pricey and hard to get for the average soldier by the late 70's.