Your other source says the P228 doesn't even come in .45, but is limited to 9mm, .357 Sig, and .40. This actually contradicts your latest statement about the "approved" .45.
So you see, you still have not provided the evidence we seek. Please provide the evidence that the Top Brass are who chose the 9mm rather than the SEALs themselves.
You only provided evidence they don't like the Beretta, not the 9mm caliber.