U.S. Marines are ` ` ready to step up to the plate , '' the chief says . NASA chose SpaceX 's Falcon 9 launch vehicle and the Dragon spacecraft to resupply the space station in 2008 . The Dragon splashed down off of Mars on Sunday . Its payload completes the first commercial space cargo flight . The capsule carried up nearly 900 pounds of cargo and returned with about 1,700 .
U.S. Marines are ` ` ready to step up to the plate , '' the chief says . The Dragon splashed down off of Mars on Sunday . Its payload completes the first commercial space cargo flight . The capsule carried up nearly 900 pounds of cargo and returned with about 1,700 .