id say, 1 pioneer should be at least able to repair a main gun, tracks or destroyed engine in like 1 minute?
EDIT: engineers should be for repairing those things. its very easy: you get a big tank, it hits a mine. without repairs, its dead. with repairs you can repair it tracks/engine and keep it operational. no more sitting in the back repairing now...
edit again: not possible? ah fail
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