Mr Trump said on Tuesday he wants a new military branch to be developed that recognises space as a "theatre of war".
Omitted from Trump's list of armed forces branches were the Coast Guard and (presumably comprising a large part of the crowd at Marine Corps Air Station Miramar) the Marines.
"Our service members will be vital to ensuring America continues to lead the way into the stars, we're going to lead in space", he said.
In no time, social media was mocking the president's comment and, of course, began spewing out memes. "We may even have a space force".
The only thing better than its glorious dated theme song is that the 30-minute program co-starred a young, dashing Fred Willard as Capt. Thomas Woods.
Many in the military are resistant to the idea of a new space arm, with chief of US Strategic Command, Air Force General John Hyten, suggesting last November that while reform to eliminate bureaucracy is necessary to stay ahead of the Russians and Chinese, the idea of a Space Corps is wholly unnecessary.
The main objective of the president's visit to San Diego was to look over proposals for his massive border-wall campaign promise. "We have the army, the navy ..." "We'll call it the space force and I was not really serious and then I said, 'What a great idea".
"You know, I was saying it the other day because we are doing a tremendous amount of work in space", he told the group of U.S. Marines. Maybe we'll have to do that'.
While Trump was nearly jokingly floating the idea, there has always been a military aspect to the space race.
Last week, Trump spoke of a special future US mission to Mars. "We are finally going to lead again".
A lack of funding for NASA in that budget request would seem contrary to the creation of the "space force".