LVT 4 & LVT A4 are open top. LVT A1 is closed top.
LVT 4 = 1 step units.
LVT A1 & LVT A4= 2 step units.
LVT A1 & LVT A4 both have inherent leaders.
Ocean traveling LVT 4’s do not suffer leader decapitation while at sea, which would make no sense at all, as other landing-craft would still head for the landing beaches regardless if the Colonel in another craft was killed or not and most likely his death would be acknowledge for some time.
LVTA's should have been given an amphibious armor symbol.