NASA, Orbital ATK and United Launch Alliance (ULA) are now targeting launch of Orbital ATK’s seventh commercial resupply mission to the International Space Station no earlier than Tuesday, March 21. During prelaunch testing March 10, ULA discovered a booster hydraulic issue at the pad, and the additional time will allow their team to replace a component and continue with launch preparations. Orbital ATK has contracted with ULA for an Atlas V rocket for the mission, which will launch from Cape Canaveral Air Force Station in Florida. The Cygnus spacecraft is packed with 7,600 pounds of supplies and research for crew aboard the orbiting laboratory. Both the cargo spacecraft and Atlas V rocket remain secure in their processing facilities.