The + 1 deal basically give this to the surprise factor and the fact that many of the weapons carried are mostly fully automatic assault rifles (MP 40 and 44/ Bren gun and not junk like sniper rifles . small pistols and one shot then reload guns.
Imperious Leader
Nice point imp, i think because of this paratroopers should defend at 1 against an attacking force that includes at least one tank. The Germans wasted the isolated British paratroopers in Op Market Garden.