The third knife, either from the top down or from left to right, depending on the picture looks to me to be sure a WW2 U.S.M.C. The others I can't see enough to make me sure one way or the other.
The fastest way to ID a reproduction KA-BAR marked 1219C2 style knife is to study the pommel. They were made during the War with either a 1/4" thick pommel or a 3/8" pommel.
During the War Union Cutlery,(KA-BAR), never fastened a thick (3/8") pommel to the knife tang with a cross pin.
All of the KA-BAR reproduction knives made after WW2 use a 3/8 thick pommel attached to the tang with a "blind" cross pin.
(blind pin)- the pin will only be visible from one side of the pommel. Other words it does not go all the way through the pommel.
The link below may be helpful in describing the repro KA-BAR's