What two actors in the MASH series actually served in KOREA?

In the MAS*H series, actors Alan Alda, who played Hawkeye Pierce, and Mike Farrell, who portrayed B.J. Hunnicutt, both served in the U.S. military during the Korean War. Alda served in the Army Reserve, while Farrell was a member of the U.S. Marine Corps. Their experiences helped inform their portrayals of characters in the series, which blended humor with the realities of war.