This meant that the T-15 crew was only fully protected against indirect blast and splinter damage, and reasonably well protected against small arms fire (except at point-blank range perpendicular to the armour), but was not protected at all against most light anti-tank rounds, such as the .50 BMG, the 0.55 in Boys anti-tank rifle, the German 13.2 mm TuF or indeed its own 13 mm Hotchkiss round.