Pat
Three Thousand Club
Keidivh
. Haven't been able to find a specific date or year aside from what you've reported. It appears to me that the United States had 14 Months since the declaration of war, a little over a year, to develop, mass produce, and somewhat commonly issue body armor and improved steel helmets to approximately 20k-30k (closer to 20k) troops. I can find that factoid for you if you want.