WW1 Weapons and Vehicles?

Does anyone know of any mods/addons for WW1/Post WW1 weapons and vehicles?I know some DOD weapons could be used, but only 1 or 2 could be used in the 1920’s era.
If you want to know why I want to know this see http://www.facepunch.com/showthread.php?t=765875

Thanks
Mort and Charon