Movie connections, part 2a

I’ve mentioned before how, years ago, I created a series of interesting movie-trivia puzzles for my colleagues on the IMDb, puzzles that couldn’t be solved using the IMDb. I posted one of them here and have intended (and still do) to post others. What I didn’t expect was to create new ones, but that’s just what happened yesterday afternoon, so without further ado, here it is:

There’s an actor who, in one film, played the badass leader of a hardcore military team obliged to drag along a bespectacled Ph.D. with mission-critical knowledge. The same actor, in another film two years later, was himself the bespectacled Ph.D. with mission-critical knowledge dragged along on a mission with a team of military badasses. Who is it, and what are the films?

Since this puzzle is new, I’m not going to include the answer here. I’ll post it in a week or so.