Nonetheless the Pentagon has endorsed the program with design ideas already having been released for the force's official logo.
Trump said in the East Room of the White House: "My administration is reclaiming America's heritage as the world's greatest spacefaring nation". He also says that the current system, with the Air Force in charge of military space operations, is not ideal.
Space warfare capabilities are now overseen by the US Air Force.
"President Trump and I are grateful to Secretary Mattis for this department's diligence in preparing this report, and our administration will soon take action to implement these recommendations, with the objective of establishing the United States Department of the Space Force by 2020", Pence told the crowd at the Pentagon.
"As President Trump has said, in his words, 'It is not enough to merely have an American presence in space, we must have an American dominance in space.' And so we will", Pence said.
Vice President Pence lays out plan to create Space Force
The proposal taps into the American public's long fascination with space but with a military focus, and it faces daunting hurdles. The force would require congressional approval. "The Space Force will not be built from scratch", Pence said during his speech.
"Like the other military branches, the Space Force will organize, train, and equip forces to protect national security interests in the physical domain of space".
Part of the announcement for 2020 involved an email from Trump's campaign team calling on supporters to help choose one of six logos for the futuristic Space Force.
"The president told a U.S. general to create a new Space Force as 6th branch of military today, which generals tell me they don't want", Democratic Sen.
Some members of Congress and military leaders have been warning that space is no longer a peaceful sanctuary, but a domain of conflict that needs more attention and resources. If the United States leaves its satellites vulnerable to new Russian and Chinese weapons, the likelihood that these weapons will be used increases, he argued. The United States, then, is left with two options: compete in this developing battlespace or be left at a significant disadvantage.
The logos are styled like the mission patches created for space launches. China also has demonstrated the ability to hit satellites in a much deeper orbit where the military parks some of its most sensitive assets.
"Space Force all the way!" the president tweeted.
While the details are still sparse, all indications are that the majority of the personnel and activities that could end up in the space force will come from the Air Force. These would include a secretary of the Space Force, which will eventually reach the same status as the secretary of the Army or Navy and have a seat on the Joint Chiefs of Staff.
"It'll never happen. He's just feeding them a bit more Trump red meat", his critics said. Not better support for armed forces veterans.