He also served in USAAF during WWII, making Colonel. He served in the Air Force Reserves, retiring at Brigadier General; and was promoted by Reagan to Major General after retirement. So he played characters in the Army, Navy and Air Force; and served in the Army and Air Force.
And Glenn Ford played roles as Army, Navy and Air Force. He served as enlisted Marine Corps during WWII and post war as Navy Reserve, retiring as Captain.
Kevin Costner did a (horrible) film as a Coast Guard swimmer (and please note I am not admitting I watched it), so maybe someone (certainly not me) can dredge up some other films he did that might make him “win the thread”.
I’d rather pluck my eyes out with a latch-hook tool.
Charlie Sheen almost makes it: **Platoon **(Army), **Navy SEALS **(Navy) and Hot Shots! (Air Farce). I don’t see much of a chance he’ll ever play a marine, though.
Maybe The Secret Service? 
Why not? Katy Perry did.
Army: Dances with Wolves
Navy: No Way Out
Army Air Corps: “The Mission” episode of Amazing Stories
He also played a Vietnam veteran in The War but I can’t find what service his character was in. But if he was a Marine, we may have a winner.
The movie’s been posted on YouTube if anyone’s willing to take one for the team and watch it.
Hot Shots! was the Navy. Said so right on the planes “THE NAVY”.
Dennis Quaid might be in the running.
Coast Guard: Yours, Mine and Ours
Army: G.I. Joe: The Rise of Cobra (At least I think his character was an Army general. If not, he was an uncredited extra in Stripes.)
Air Force: The Right Stuff
Navy: Innerspace
So all we need is a movie where he played a Marine.
Enemy Mine?
Michael Biehn’s worth mentioning…
Futuristic Army in Terminator
Futuristic Marines in Aliens
Navy Seal, three different characters in three movies…
No Air Force roles yet that I can find.
And in a peculiar inversion, actually played an Air Force Colonel when IRL, he was a Brigadier General.
My dad and I wondered if he just kept the prop uniforms, or if he just wore his own after that movie. The brass would be the only change.
With Andy Griffith you get the Coast Guard:
Onionhead (USCG)
No Time for Sergeants (USAF)
tv version of From Here to Eternity (Army)
According to this, he played a Marine officer – apparently on embassy duty – in Savior.
And in all five cases, either dead or severely wounded by the end of the movie.
Gordon Cooper served as an enlisted Marine, then was commissioned in the Army, then transferred to the Air Force. So Dennis Quaid might win on a technicality.
Don Terry:
Navy–Don Winslow of the Navy
Coast Guard–Don Winslow of the Coast Guard
Army–Top Sergeant
Canadian Army–Unseen Enemy
In Drums of the Congo, his character is a captain, but imdb doesn’t say what service.
Throw in Sea Spoilers for the Coast Guard and you’re all set!
(With bonus points for the 1st American Volunteer Group, in Flying Tigers!)
Robert Ryan.
Army: The Dirty Dozen.
USMC: Flying Leathernecks.
Navy: The Man Without A Country.
Air Corps: Bombardier.
Coast Guard: The Woman On The Beach.
And let us not forget another famous Air Force role, Tarantula.
There was no U.S. Air Force when Bud and Lou were at the height of their popularity. But the Air Force was originally the Army Air Corps, and there WAS an Abbott & Costello movie called*** Keep 'Em Flying***, in which they were in the Army Air Corps.
And let us not forget another famous Air Force role, Tarantula.
[/QUOTE]
::shakes head ruefully::
He used to stack guys like you five feet high in Korea, use you for sandbags.
For the sake of filling out what Bryan Ekers was shooting for, IMDB lists Eastwood as one of the sailors in The Enemy Below, which brings us to Robert Mitchum:
USN: see above. Also, Midway.
Army: The Longest Day.
USMC: Heaven Knows, Mister Allison.
Air Force: The Hunters.