WOTW US Army, National Guard, and Militia Troops

I am working on a major 1/72nd scale figure sorting and conversion project.

My plan is to have American Regular Army, State Militia, National Guard, and local militias for War of the World invasions.  They will be separate units for every 20 years starting in 1898, 1918, 1938 and 1958.  The first three are the primary focus on this project for now.  I am planning on about a regiment of each but the regiments will mostly be small from those days.

Here is some of my artillery.  The French 75 was used from 1917 to about 1945 by various US Army units.  By the end of WWII they were likely all gone by then.  This is 24 of them with the original wooden spoked wheels for World War One, and 24 others that have rubber tires and they will work for the 1938 time period.  24 is enough to support two battalions of infantry.  All 48 can be in use for the 1938 period.

I am sorting figures on my table, in units of about 50 or so troops.  Prior to WWII most units in the Regular Army, National Guard, Reserves, and militias were way understrength much of the time with companies having as few as 50 men.  I am also working on American police and Royal Canadian Mounted Police RCMP for the same period.  It's a big project and just the research has taken years, but it is all starting to come together.  It will likely take me another year or so to finish but it has been going on now for at least 10 years so far.