I'm gonna land a plane on it
but seriously, not to nitpick but
that would be the battlement, hard as stuff to capture.
you put machine guns on it. most of the combat revolves around not being hit, and you go and put stationary bullet sprayers in the already narrow openings.
that's a Lot of areas to watch. 4 directions plus the forgetin sky? nah son.
not to mention the MGs have a narrow opening to shoot from. people can hide underwater near the corners shotguns drawn and surprise murder the defenders.
also the cramped looking layout of the interior means it's pretty easily sweepable with a grenade-launching rifle or a skilled rocket launcher.
haven't yet seen it in action but "hard as stuff to capture" is a tall judgement