The next flight of United Launch Alliance’s triple-barrel Delta 4-Heavy rocket has been delayed from June to late August, military officials said Friday.

Rocket Lab’s Electron rocket is set to launch 13 CubeSats Saturday night (U.S. time) under contract to NASA from the company’s privately-owned spaceport in New Zealand, a pathfinder mission that could pave the way for more NASA satellites to hitch a ride on future Electron flights.

Watch NASA’s Orion inflight abort test post-launch news briefing, held at the Kennedy Space Center two hours after the test.