Some say the ships will need to refuel at port facilities:
CNN don't speculate on what happened... it's more convenient that it hit ''ground'' and not been hit by something. It look like they have manning problems to operate enough oilers too:
''Military Sealift Command, the Navy's civilian-crewed auxiliary division, has a serious long-term manning shortage and has reportedly had challenges crewing up some of its oilers, reducing the available supply of replacement ships.''
