A soldier of the U.S. Seventh Marines carries a puppy in his pocket after rescuing it during an operation southwest of Da Nang in Vietnam on Jan. 22, 1968. Photo and description courtesy of NBC News, The Vietnam War in Pictures.

A soldier of the U.S. Seventh Marines carries a puppy in his pocket after rescuing it during an operation southwest of Da Nang in Vietnam on Jan. 22, 1968. Photo and description courtesy of NBC News, The Vietnam War in Pictures.