Waterside view of Delta 4 GPS 2F-6 Launch

A Falcon 9 rocket aborts its lift off at the final moment on February 28, 2016, as seen from the press site at Cape Canaveral Air Force Station. The rocket was supposed to launch the SES 9 communication satellite and had already been delayed by fueling problems and a boat that strayed into the launch danger area off shore.

The 32-story-tall mobile service tower is retracted from the Delta 4 rocket at Vandenberg’s Space Launch Complex 6 pad for the NROL-45 flight that will place a surveillance satellite into orbit for the U.S. National Reconnaissance Office.

The launch of NASA’s Parker Solar Probe, on the verge of kicking off a seven-year mission culminating in passages through the sun’s atmosphere, has been delayed to Aug. 6 to resolve a technical snag encountered during encapsulation of the spacecraft inside the nose shroud of its United Launch Alliance Delta 4-Heavy rocket.