Seems a fine thing for some robotics to solve. There are so many we can’t possibly train all the sappers needed. Or risk people for it either.

First iteration literally plants a flag in the ground. Second could surface. Third could defuse.

Given the vast areas now involved, any push is going to be massively hindered by these fields. Combat ready models a requirement too then. Something bigdog like with a metal detector, ground penetrating radar, and/or underground sonar would be my starting point