Two US military aircraft were hit by incoming fire from South Sudan rebels Saturday. One of the planes reached Uganda heavily damaged with four injured four US servicemen aboard, one of them critically wounded. They were flow to Nairobi, Kenya, for medical treatment. The US aircraft, apparently evacuating Americans from the embattled country, were heading into rebel-held Bor when they were hit by ground fire. One turned around and headed to Kampala. Officials at the US military’s Africa Command did not immediately answer calls.