Black OPFOR uniform

Photo courtesy https://www.facebook.com/1-4-Infantry-Regiment-156335791124263

Came across this on Facebook today.
https://www.facebook.com/media/set/?set=a.906453626112472.1073742044.156335791124263

Didn't know about this all black uniform earlier. 1st Battalion 4th Infantry Regiment are currently based in Hohenfels, Germany, in an OPFOR role.