The May 16, 2014 launch of a United Launch Alliance Delta 4 rocket carrying the GPS 2F-6 navigation satellite. Video: Stephen Clark/Spaceflight Now
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Delta 4
First of up to seven ULA launches this year set for Saturday
The first of up to seven missions planned on United Launch Alliance’s Atlas and Delta rocket fleets this year is scheduled for Saturday from California’s Central Coast, when a Delta 4-Heavy is set for blastoff on a spy satellite delivery flight delayed a month to troubleshoot a hydrogen fuel leak in a booster.