My understanding is that the U.S. military converted from .45 caliber to 9mm pistols because the later ammunition type had become NATO's standard.
The original poster's comment of other soldiers being curious of the new Berettas reminded me of when we started using digital cameras at jobs in the early 1990s. Our first digital camera was a Kodak DCS 100, approx. $15,000 and while very revolutionary technology it was almost completely impossible to use in the field. That was replaced by a DCS 200 which was slightly better and a little cheaper at $10,000 ... for a 1.5 MP camera! The battery was internal, however, and it wasn't long before these cameras could no longer be recharged, so these became paperweights relatively fast.
Around 1995 we started using wierd looking cameras made by Polaroid, the PDC 2000 and PDC 3000. They looked like they were made for Batman. The PDC 3000 actually used a removable compact flash card, which was pretty slick at the time. Unfortunately, the recycle time between pictures was about 11 seconds so they were somewhat inconvenient to use at ceremonies; we continued to shoot with film and then scan the negatives with digital scanners.
Anyhow, what I remember is how curious and interested people were in our cameras and with digital imaging in general. The technology wasn't yet accessible to the average person. Our commanding officers liked to show off the capability to visitors and have us print pictures before the visitors left the building. Customers seemed to enjoy the
novelty of digital portraiture once we made our studio fully digital.
Our final Kodak DCS camera,
a 460 model, costed the Air Force $28,000 in 1996; it now sits in our display case outside our office as an archaic curiousity. (A blogger who recently bought one
wrote to the dpreview.com forums: "In a wider sense it is hard to research the DCS 460 because it almost predates the World Wide Web, and of course the people who used it in 1995 have long since moved on. And life was very different back then, the people were very different." Hmmm, I don't feel so 'very different'?)