Tom Paxton -- US Army.
Pete Seeger -- USAAF, Pacific.
Woody Guthrie -- Merchant Marine, US Army.
Cisco Houston -- Merchant Marine.
Elvis Aaron Presley -- US Army.
Al Hirt -- US Army.
John Wayne -- rejected by US Naval Academy, accepted by OSS but never received the letter because it went to his ex-wife's house.
Ronald Reagan -- 1st LT, US Army, never left the States.
Walter Brennan -- Private, US Army Artillery, WWI
Bob Keeshan -- US Marine Corps (but did NOT serve with Lee Marvin).
Julia Child -- OSS, Far East.
Abraham Lincoln -- Illinois Militia, 1st LT, then PVT, Blackhawk War.

That's enough for now.