Richard Donald Crenna (November 30, 1926 – January 17, 2003) was an American motion picture, television, and radio actor and occasional television director. He starred in such motion pictures as The Sand Pebbles, Wait Until Dark, Body Heat, the first three Rambo movies, Hot Shots! Part Deux, and The Flamingo Kid. Crenna played "Walter Denton" in the CBS radio and CBS-TV network series Our Miss Brooks, and "Luke McCoy" in ABC's TV comedy series, The Real McCoys, (1957–63), which moved to CBS-TV in September 1962. Crenna was in one of the few TV political dramatic series Slattery's People on CBS. Crenna played "Colonel Trautman" in the first three Rambo movies. He also played "Frank Skimmerhorn" in the critically acclaimed mini-series Centennial.
Description above from the Wikipedia article Richard Crenna, licensed under CC-BY-SA, full list of contributors on Wikipedia
