manly men's men

I can find no reference to this photo anywhere on the web.  It's a who's who of tough guys.  No fondant for these guys.  I'm assuming it is John Wayne's birthday or retirement or something.

Lee Marvin, Clint Eastwood, Rock Hudson, Fred MacMurray, John Wayne, James Stewart, Ernest Borgnine (he's 93 btw), Michael Caine, and I think the last guy is Lawrence Harvey)