>>463　ぐぐってみたところ
https://www.proxibid.com/Firearms-Military-Artifacts/Firearms/Beretta-M9-General-Officers-Pistol/lotInformation/49407603

>These pistols in all respects were a standard Beretta M9 handgun only they were identified by a special serial number with a "GO" prefix.

だと。なんとも面白味がないというか、全軍の作業服をウッドランドBDUに統一してた頃の米軍の、本気さ加減の一片というか。