Consider yourself dead already. Put it behind you. Fear is normal, but we have a job to do
But, then Peck's original premise to his troops is shattered when he turns into a vegetative state until the planes come home, just like the previous commander. And then I think he gets relieved of command at the end for "stress". Obviously, movies are movies to entertain. And yes, he is a good actor especially when he was going to shove that knife into the antichrist. BUT, with that said, good leadership movies are re-enforcers, like We Were Solders, with Mel Gibson. A commander doing a job, not because he likes it, but doing it well anyway, and showing how you succeed.
A better example of leadership, and it is not a military move but more reflective of today's issues is Dirty Harry. Here is Harry Callahan (The Conservative Consciousness of the U.S., battling the punks (Al queda and the other roaches) and we have his boss and city council (the U.N., EU,) criticizing his every move as he melts out ultimate justice. Not because it is an innate behavior of his to want to sociopathically kill everything, but because society is upside down (muslims rioting over stupid cartoons), and there is no way out except through the barrel of a .44 cal weapon (GWOT).
It wasn't a feature film, but "Band of Brothers" was the best primer on good leadership and bad leadership I've ever seen.