I'm reminded of the 72 hour burst put on by Pearl Harbor to get Yorkton operationally ready of the
battle damage she sustained in the Battle of the Coral Sea in time for her to participate in the Battle of Midway. Don't expect that these days.
I'm also reminded that as a young gunner I could fix most the things wrong with my 3/4 ton and any major component replacement - including engines - could be done by your average battery RCEME team. These days, even for the simplest of vehicles, there are entirely too many specialized components which need specialized diagnostic tools with too few parts available. Don't get me started on optics and weapon systems.