Both the American and British sets come a great variety of poses, more than you'll find in any plastic kit or single metal range, and include all you need to field a well-rounded infantry force.
Both 15mm and 10mm-scaled STLs are included. These are identical sculpts, except that the 10mm versions have much thicker barrels on their rifles. If you want to play things extra safe with your models' durability, you can consider printing the 10mm versions at 150% scaling for super durable weapons.
Please note that, if you want the new NATO and VDV figures to be identically scaled to the older Motostrelki and East German figures, you'll want to print the 15mms at 93% scaling (or, if exporting from Blender [where the sculpts are natively 10mm scaled], 140%).
The American Infantry STLS are armed with M16 rifles, M249 SAW light machine-guns, M203 Underslung Grenade Launchers, SMAW AT Launchers, M72 LAWs, Stinger MANPADs, an M47 Dragon ATGM, and an M224 60mm mortar.