That got me curious as to what numbers people choose when having a "Nth Something Something."
The breakdown:
1st -15 corps 11th - 8 corps 21st - 15 corps 31st - 7 corps 50th - 1 corp
2nd - 8 corps 12th - 5 corps 22nd - 8 corps7 32nd - 6 corps 60th - 0 corps
3rd - 11 corps 13th - 10 corps 23rd - 10 corps 33rd - 5 corps 70th - 2 corps
4th - 12 corps 14th - 7 corps 24th - 13 corps* 34th - 3 corps 75th - 5 corps
5th - 12 corps 15th - 1 corp 25th - 4 corps 35th - 0 corps 80th- 0 corps
6th - 8 corps 16th - 5 corps 26th - 3 corps 36th - 2 corps 82nd - 7 corps
7th - 11 corps 17th - 10 corps 27th - 5 corps 37th - 3 corps 90th - 0 corps
8th - 13 corps 18th - 3 corps 28th - 5 corps 38th - 0 corps 100th - 1 corp
9th - 18 corps 19th - 3 corps 29th - 4 corps 39th - 2 corps 101st - 25+ corps
10th - 12 corps 20th - 1 corp 30th - 2 corps 40th - 0 corps 501st - 12 corps
*Removed "24th Imperial Crusade" from the count
As you can see, the numbers start to drop off near the late thirties. That plus my lack of will to go any further just had me pick the remaining tenths and numbers corresponding to popular/well known military units (both real and fictional).
Also, during my research I found a few corps who used a zero instead of a capital O to being their corp name. Possible anti-linking protection, or just to be different?