Benchmade did indeed make the GPA for Al Mar, but Benchmade wasn't the only U.S. manufacturer with whom the company contracted. The SERT
the Auto-SERE
and the WOR-TAC (full size and mini)
were all manufactured by Paragon Cutlery in North Carolina.
I believe the Auto SERE 2000 was a return to Benchmade, but I don't know that for a fact. The lines and grinds sure look right, though.
I don't know who made the original SERE Operator. It was very well executed, but there were numerous American companies capable of doing that level of work back then.
Of course TOPS began making the new Mini SERE Operator in 2017.
Al Mar has never had a manufacturing facility that I'm aware of. It's only ever been a design company that contracted manufacturing.
-Steve