Musta been a "golden" BB floating crit roll...
Only way that could have happen.
Sad, hope the crew got out and little or no injuries.
TT
It's still subject to the laws of physics. 9 destroyed in Gulf 1, 35 or so over the course of OIF, plus Iraqi army losses against ISIL and Saudi losses in Yemen.
Plus, none of the export tanks have the DU NERA (Non-Explosive Reactive Armour) arrays. They've been removed and replaced with a different armour package and that conversion process was one reason why Abrams arrived later in Ukraine than the Leopard 2s.
Regardless, the turret front looks undamaged. The M1 isn't significantly better protected from the top or rear than other tanks, although I seem to recall the turret side armour is reasonably heavy even behind the crew compartment. Either way, the entire top and rear are vulnerable. That's hardly a golden BB slipping through a gap in the protection like directly hitting the co-ax or a periscope. Drones being used to make rear/top attacks against tanks has been going on for months now.