Well there was several reasons for getting rid of it. One it was rather getting long in the tooth. The youngest were made during WWII and after years
of service life and repairs it was getting to the point where they couldn't fix them any more. So if we are going to spend all this money on new
pistols might as well get a new design. Then there was the commonality with the rest of NATO who uses the 9mm round. Finally its a lot easier to train
someone using a 9mm than it is with a 45acp. BTW the Beretta has been supplmented in service by the Sig Sauer 228.
PS you have the dubious honor of my first post here