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This was the first time NASA agreed to the use of a previously launched first stage. With the first stage and capsule both reused, only the second stage and one out of 10 Merlin engines was new and will not be available for further reuse.
I have embedded the launch video below the fold.
The standings for the most launches in 2017, as of today:
28 United States
Note that I am counting Soyuz launches for Arianespace out of French Guiana under Arianespace, not Russia. Also, the U.S. total includes SpaceX. I have separated SpaceX out to show how a single American company is competing aggressively with whole nations.