@Hudson Adams,
Could you make a dual set for the Americans? Given the crossover between the wars, and how close their equipment was, a simple set for the American's would be really easy.
All you'd need is three heads (WWI helmets and WWI helmets with gasmasks, and WWII pot helmet heads), two rifle types (M1903 Springfield and M-1 Garand) and maybe a BAR. Model one body with either pouches for rifles, or the BAR. Have grenads and bayonets already modeled on the bodies. Maybe one with a holstered pistol. Throw in a couple Thompson SMGs, and you're set. I'm fairly certain that'd fit on one five figure sprue.
After that, a set of WWII Marines (post 1943). Then a weapons platoon set (mortars, MMGs, HMGs, Bazookas). Three boxes- loads of World War awesomeness. And all cheaper and likely scaled nicer than Warlord Games.
This is a great idea but I don't really think it will happen. Wargames atlantic is obsessed with their death fields and baron's war lines, and of course their dark age stuff that can't compare with victrix. First of all you could not build an accurate ww1 american unit from your suggestions. The M1918 BAR came to late too be used in the war, we used the the chauchat light machine gun (Wargames atlantic already has these on the ww1 french set though). Secondly the most common rifle we used was the M1917 american Enfield, a version of the pattern 14 rifle chambered in .30-06 springfield. (I think these already exist on the BEF Sprue). Additionally there were differences between US Uniforms in the wars. American uniforms in ww1 better resembled british uniforms of the same war. To squeeze two kits onto the same sprue would be to smooth the unique pieces of kit that the US army used in each war. For example if you include Thompsons, bazookas, and Bars, those are useless in ww1. While M1917 rifles, gasmasks, and the british brodie helmet were not used in the late war, and shotguns were rarely issued to frontline US Army Troops (the marines used them though). I think a dedicated ww1 American Expeditionary Force kit would be better. This would have the following weapons, M1911 pistol, M1917 revolver, M1917 rifle, Springfield M1903, Chauchat Light Machine Gun, rifle grenades, grenades, trench knives, and possibly the hotchkiss benet mercie (these were used only for training and were about as bad as the chauchat, they were nicknamed daylight guns because they were impossible to repair in the dark), also shotguns like the browning auto-5 and the winchester trench gun. I might suggest throwing in a medium machine gun, like WGA did on the italian army sprue, this being the M1917 browning. As for a us army ww2 set, I would suggest leaving that to Warlord Games and Perry Miniatures. Both of those companies make far better sets of infantry in my opinion. But a ww1 infantry set is something we need. If you really want it to crossover with ww2 early war us marines (think wake island and the phillipines) used some of this older kit, such as the brodie helmet and springfield rifle so I think that is the best option for a crossover. Also if you are ever in hudson mass, check out the american heritage museum, they have an excellent exhibit on the us army in ww1.
hey, WGA's making the eight thousandth french napoleonic set in the industry, so who knows? i would definitely prefer ww1 americans first, though.