"Or 9mm Glisenti."
That wouldn't work.
It was dimensionally identical to the 9mm Luger, but loaded to lesser velocity.
It also occurs to me that we'd have to define "government."
Are we talking strictly Federal government, or are we talking State and Local governments, as well?
If only Federal government, that would immediately rule out .45, .40, .357 Sig., .357 Magnum, .38 Special (Smithsonian Police are armed with .38 Special revolvers), 9mm, .22, and possibly others. .44 Magnum may be ruled out, as well, as some special units issued that at times.
That would hopefully leave us 10mm (unless someone is still using the MP 5/10), .41 Magnum, would probably result in a rebirth of the .41 Action Express, hopefully .32 and .380 ACP, should leave .38 Super, .32 Long, .32 H&R Magnum, .327 Ruger, .44 Special, .45 Colt, and a bunch of others.
Who knows, that could bring to fruition my interest in a J-frame sized revolver in .41 Long Colt.