The March 9 launch of an Ariane 5 rocket carrying the Eutelsat-65 West A commercial telecommunications satellite.

Thursday’s briefing begins with a top U.S. Air Force launch official saying the Pentagon is looking at using Ariane 5 rockets to launch U.S. military satellites as a potential stopgap measure.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...