What on earth have voting machines to do with anything? Is this some weird US politics reference?
Popular name for South Vietnamese armour as they played a role in every coup. Diem was assassinated in the back of an M113 and Nguyen Cao Ky made sure that the VNAF had its own tank unit based at Tan Son Nhut. Why did the South Vietnamese air force need a tank unit you ask? Because the General Staff HQ and the organs of military power, essential in a coup, were based there.
Of course, if like me, you have recently had the pleasure of going through customs and immigration at SGN, with multiple planes landing at the same time, then you might wish you had one of those tanks.