Appearing before a crowd at Marine Corps Air Station Miramar in San Diego, President Donald Trump reignited a seemingly dead call for a dedicated space-based branch of the military.

Space is a war-fighting domain, just like the land, air, and sea,” Trump said. “We may even have a Space Force, develop another one, Space Force. We have the Air Force, we’ll have the Space Force.”

The idea of a space branch of the military was floated last year as well, when the House Armed Services Committee introduced legislation calling for the founding of a “Space Corps” devoted to operationalizing earth orbit in much the same fashion America’s competitors are already setting about doing. That bill, proposed by Republican Rep. Mike Rogers and Democrat Rep. Jim Cooper, criticized the Air Force for failing to meet the growing demands of the domain, in part, because insufficient funding was being allocated to the cause, and also because the officials tasked with managing the space effort were not given sufficient authority to bring about any actionable change.

That Space Corps was to fall under the Department of the Air Force in much the same way the Marine Corps falls under the Department of the Navy.