Duke, no problem. As long as the images and information is relevant, post as much as you'd like. The more information we can gather on gas-masks as used by the AEF in one place, the better.
Speaking of gas-masks and respirators, here's a photo of, from left to right. a French M2 mask, an American corrected English (CE) mask, a French 1917 ARS mask and a 1917 German Lederschutzenmaske worn by American ambulance personnel.