CAPE CANAVERAL, Fla. -

The United Launch Alliance will attempt to launch a Delta IV rocket on Monday evening from Cape Canaveral Air Force Station, marking the fifth try in the last week.

The opening of a 65-minute window begins at 6:43 p.m., but weather pushed the projected clear weather time to 7:28 p.m.

Technical problems scrubbed the first try, but thunderstorms and light­ning washed out the next three countdowns on Thursday, Friday and Sat­urday.

With the day off, the 206-foot Delta IV and its payload were returned to the shelter of a mobile ser­vice tower at Launch Complex 37. Atop the rocket are twin satellites that will look out for threats from other spacecraft orbiting more than 22,000 miles up, and a third experimen­tal satellite.

The mission's delay to Monday has pushed back by one day, to Friday, the next launch on the Cape schedule: an Atlas V rock­et carrying the seventh in a new series of Global Po­sitioning System satel­lites. That launch is now planned at 11:23 p.m. Friday, with an 18-minute window.