Although Tom Hanks has never served in the military, in 2006 he was the first actor inducted as an honorary member of the US Army's Ranger Hall of Fame—for a part he played in a film!
In the movie Saving Private Ryan, Hanks plays Cpt. Miller, a WWII Army Ranger company commander opposite Matt Damon, a young soldier that Hanks' character is tasked with bringing home from war.
The induction was partially awarded because of Hanks' dedication to honoring war heroes through his work as a national spokesman for the WWII Memorial Campaign and as a chairman of the D-Day Museum Capital Campaign. He was also one of the writers and producers on Band of Brothers, an Emmy-award winning miniseries about the Western front.
It's difficult to get inducted to the Ranger Hall of Fame without being a career soldier. Most inductees, aside from the honorary ones, must have served in a Ranger unit or be graduates of the prestigious Ranger School located in Fort Benning, GA.