It seems like the US military is starting to turn into Japan or Italy in WWII with an excessive number of service cartridges.
The pendulum swings back and forth, with a few low points along the way...
1890- .45-70-500 rifle, .45-55-405 carbine, .45 revolver (Schofield length case).
1918- .30-06 M1906, .45 ACP
1950- .30-06 M2, .30 M1 Carbine, .45 ACP, .38 Special
2000- 7.62x51mm, 5.56 M855, 5.56 M193, 9mm NATO (and some .45 ACP in SOCOM or .300 Win Mag for snipers)
How many are in use now?

