A Falcon 9 rocket blasted off from Florida's Cape Canaveral Air Force Station, carrying the GPS satellite to orbit.

"Ahem. We are expecting royalties from this," tweeted George Takei, who played Sulu in the original series.

Twitter users were quick to mock the U.S. Space Force's inaugural uniform for being camo green instead of the seemingly obvious black.

Space Force, which has become a reliable applause line for Trump at his campaign rallies, has yet to win final approval by Congress.

Details about the administration's Missile Defence Review - the first compiled since 2010 - are expected to be released during President Donald Trump's visit to the Pentagon.

The U.S. Department of Defense says the development of anti-satellite laser weapons by China and Russia is among the key concerns necessitating the need for a U.S. Space Force.

The Space Force would be the sixth branch of the military, which currently consists of the Air Force, Navy, Coast Guard, Marine Corps and Army.