The Soviet Lun Class Ekranoplan was capable of just on 300 knots with a range of 1,000nm - it just needed flat water..

© USSR Look familiar?
OK. So the delivery system is different, to say nothing of the overall mission parameters, but the AC75 and the Soviet, Cold War era Lun-class Ekranoplan do both use ground effect. Both are designed to be combatants. Both get the job done smartly.