Critics argue that Trump's Space Force would be stepping on the toes of the U.S. Air Force Space Command, which now oversees the nation's military operations in space. No new service branch has been established by Congress since the creation of the U.S. Air Force in 1947 - over 70 years ago.
The new force would also aim to streamline existing space-oriented units within the existing branches of the armed forces.
United States Secretary of Defence James Mattis also spoke at the Pentagon
"We need to address space as a developing war fighting domain and a combatant command is certainly one thing that we can - we can establish", Mattis told reporters.
The current branches of the USA military are the Navy, Coast Guard, Marine Corps, Army and Air Force.
According to the plan, the Space Force will comprise three units.
And yes, one of these just says "Mars awaits" even though presumably the Space Force is not just about Mars.
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The U.S. Air Force is now responsible for defending American satellites and spacecraft.
Pence said the White House already has been working with Congress to develop the plan.
The concept of a Space Force was first proposed in 2000.
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The current administration said that it hoped to establish a new military Space Command and a Space Operations Force, which would bring in professionals in the space industry.
But, earlier this week, Mr Mattis said he is in "complete alignment" with Mr Trump's concerns about United States space assets. At Trump events, "Space Force" has come a common rallying cry, with some Trump supporters wearing Space Force T-shirts in the crowds. As a first step, Pence today announced a Space Command that oversees satellites across the military.
Space Force gave the late night talk show host a lot of material to work with for Thursday night's episode.
Trump has pushed for the separate space command against the advise of his top military leaders, including secretary of defence James Mattis, who opposed the creation of a new force in a letter to Senator John McCain, the head of the Senate armed services committee.
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United States officials have been closely monitoring North Korea's willingness to abandon its nuclear ambitions. But other techniques such as comparing teeth to dental records and bones to chest X-rays are also used.