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SpaceX was launching a GPS satellite for the military, while Blue Origin was going to fly its New Shepard suborbital spacecraft on its third flight. SpaceX will try again tomorrow, while Blue Origin has not yet announced a new launch date.
Meanwhile, ULA’s attempt to launch a National Reconnaissance Office (NRO) spy satellite tonight with its most powerful rocket, the Delta 4 Heavy, faces bad weather, with only a 20% chance of launch.
UPDATE: I missed a third launch scrub today, Arianespace’s attempt to launch a trio of French military satellites using a Soyuz rocket from French Guiana. They will try again tomorrow.
This means there will be three launch attempts tomorrow, since India plans a launch of its GSLV rocket as well.