I had one of the first Mil Reg's and it was an indestructible knife. I didn't care for the blade length or clip point though. Being a 1/3" thick clip-point made it neat knife that I only found good for batoning small firewood. It was too big for bushcraft and too small for chopping / big baton work. The clip point stuck in the logs used for batoning.

It did hold an extremely keen edge (even after batoning for three straight days of camping / testing).

My experiences with that knife made me think 6" and 9-10" are great blade lengths, but in between is sort of a "no man's land" as far as knives go.