>

My grandad was a quatermaster and used to put old tank treads in the back of his car - they weighed 80 pounds each.
ABRAMS TANKS IN WOODLAND GREEN LETS FUCKING GOOOOO >

Theyve been in a warehouse waiting for a moment like this >

Somewhere in a nondescript office at the National War College, a professor is dusting off classified wargame reports from the 1980s and thinking to himself, "finally". >

Ahhhh yes, the REFORGER battle plans. Many majors died making those things >

Springtime in Hohenfels. >

Oh god...the mud.
Saw an M1A1 there once (was LRS with 3rd ID at the time, would have been around 1988) that had the entire crew standing in the mud just staring at it (I think they were 3rd AD, but it's been a while).  We approached them and asked if they needed a hand.  They had thrown a track, to the inside...well, shit.  So we said we'd help them break track and get it fixed when the driver just laughed and told us we should look at the other side.  Yup, thrown track...to the inside.
Good luck fellla's, we gotta jet. >

Not being a tank enthusiast, I understood absolutely zero of that. ELI5? >

I'm not a tank enthusiast either but I assume that "throwing a track" means that the track came dislodged from the wheels (like a bike chain coming off the gears). Being thrown on the inside means it came off and ended up on the tank side of the wheels, which I assume is much more difficult to fix than if it were on the outside. The outside would mean that it would just be laying on the ground next to the tank. Inside means it's snagged and caught up in all the other moving parts and difficult to access and get a hold of in order to reseat it. Plus it's really heavy.