My guess is 'damage make-up.'
Seems like they got them stuck on purpose in order to practice recovery of them.. The support units have been put to test in the exercise, engineers have practicing on building bridges, clearing mines (https://twitter.com/johansutinen/status/911739895034544128 ) etc.
What the heck happened to this one? Did it go subterranean?(Image removed from quote.)
Yeah but that camouflage job really offsets the desert colors.
Same Abrams a bit earlier:(Image removed from quote.)
What is that stuff at the bottom of the ditch that looks like tar?