'Rats' are freshmen just like at Georgia Tech (my own college). 'Brother Rats' are the men from your freshmen class that have accompanied you through your entire school career. This was the movie version of a successful Broadway play (written by VMI grads), which was apparently a little racier. Ronald Reagan played opposite Jane Wyman whom he would marry in a couple of years. This was Eddie Albert's first film, reprising his role from Broadway.
Familiar face: Louise Beavers plays a maid. I saw her recently as Mamie in Holiday Inn.
Ronald Reagan and Jane Wyman
Louise Beavers and Priscilla Lane