Thompson-LaGarde tests
The Wiki link was really short and didn't cover the vehicle aspects of the testing.
There was a Quartermaster report circa 1919 (published circa 1921) and one part of it was a lengthy digression into weapons performance, most of one whole chapter was on armor/bulletproofing. The 'state of the art' described as generally light and sorry (breastplates for machine gunners) and heavy verging on useless (full suits of armor). None of which would stop pistol bullets much less rifle fire.
the book is Quartermaster Activities in World War I
Extracted From:
America’s Munitions 1917-1918
Report of Benedict Crowell, The Assistant Secretary of War, Director of Munitions
Government Printing Office, Washington - 1919
there are excerpts all over this one covers some but not often on the weapons side
http://www.qmfound.com/americas_munitions.htm
and you can read or download the whole thing
http://www.archive.org/details/americasmunitio00deptgoog
The rest of the Thompson-LaGarde test docs I found online a few years back the parts about airplanes are 'disturbing' from a pilot's standpoint, yup, I'm in a flying gas tank surrounded by high tension ignition sources oh joy now someone is shooting at the thing. The thing that really caught Thompson and LaGarde was the fact that you didn't have to hit the pilot or engine per se just cause enough damage to start a fire, gravity would do the rest. There's not much like a fire to get the undivided attention of a flight crew. No they weren't shooting at occupied aircraft, again it was pigs/goats and vehicles on the ground with the engine running and full gas tanks.
lots of graphs but really short of graphics (I'm sure lots of the pics would have been fireballs belching black smoke).