[ARC5] Korean War HF Command Set

[Tim]

OK guys - maybe a bit off topic for ARC-5 discussions but here goes - you
guys are smart:  The USMC had Tactical Air Control Parties in the Korean
War - directing close air support to USMC ground forces.

There is at least one photo of a Marine TACP unit using a GRC-9 presumably
controlling an aircraft in a CAS mission.  So the question is:  What HF set
would a USMC fighter bomber be using during that period?  Were ARC-5's in
prop/jet fighter bombers even a possibility then?  I know this system moved
to VHF/UHF but there seems to be evidence of maybe an "early" HF system in
Korea.

Ideas?

Tim
N6CC