Being a collector of Kabars and WW2 era knives, I really like the MK2 F/U knives:
The WW2 MK2s. Left to right Kabar, Camillus, Remington PAL 37, Robeson-Suredge
The Korean War - Viet Nam Era versions- Left to right - K-Camillus, VN-Camillus, Utica, Conetta, and a post VN entry - Ontario
From 1987, the enigmatic MSI (Manufacturing Specialties Inc). No one seems to know why 5500 were made as Camillus was still making MK2s for the gov't.
The post-90s versions - Left to Right - late 90s Kabar (acquired in '03), an '02 Camillus, a Kabar 1211 and a Kabar 1221 NextGen
And last, but definitely not least, is my favorite WW2 - the Western G46-8. While not a MK2 and never an "issue" knife, it served the same purpose and was supposedly widely used as a private purchase item.