Below are some links to a Google Drive that contains files related radio chatter during combat. They are really interesting as they show how soldiers communicated during firefights.
The last one are a series of 4 files which are chatter during a base attack
We Are the Mighty includes a brief analysis of the life expectancy of a Vietnam War Radioman.
Oftentimes different units would create service menus for special occasions such as Christmas, Thanksgiving or New Years. These are some examples
Below is base brochure handed out to personnel when they arrived at base and are expecting to stay awhile. This one is from Harmon Field in Stephenville, Newfoundland. Dated Feb, 1945
These could often be found at post exchanges or other on base facilities.
Below are some pdfs which show the blueprints of the M1 Garand Rifle
I had the opportunity to do a little research at the Anti-Saloon League Museum. I pulled out some documents you might be able to use to enhance your World War One Impression.
This post will contain information on Civil Affairs in World War II and how to set-up a reenacting impression around it.
Field Manuals
FM 27-5 Civil Affairs: Dec 22nd 1943.
Studies
Civil Affairs in World War II: A study from the Center for Strategic and International Studies