WASHINGTON, D.C. — President Donald Trump nominated Lt. Gen. David Miller Jr. to command U.S. Space Command with a promotion to the rank of four-star general. The nomination was transmitted to the Senate on Tuesday.

If confirmed, Miller would succeed Gen. Stephen Whiting as commander of U.S. Space Command. Whiting has served in the role since January 2024 and is set to retire at the end of the year.

Lt. Gen. Miller Jr. currently serves as deputy chief of space operations for strategy, plans, programs and requirements. He has held this position since November of the previous year.

Prior to his current role, Miller commanded the Space Operations Command. In that capacity, he oversaw the operational readiness and training of space forces across the United States.

Miller previously served as the Special Assistant to the Vice Chief of Space Operations at Headquarters, U.S. Space Force, Peterson SFB, Colorado. His call sign is "Rock."

The lieutenant general holds a Bachelor of Arts in Anthropology and Sociology from Lafayette College. He has completed advanced military education at institutions including the Naval War College and the Air War College. Miller has been certified as a Minuteman III ICBM Crew Commander and as a Space Control Crew Commander.

For his service in space operations and leadership, Miller has been awarded the Distinguished Service Medal with an oak leaf cluster. He also received the Defense Superior Service Medal and the Legion of Merit with an oak leaf cluster, among other honors.

A U.S. Space Command spokesperson confirmed the nomination. Gen. Douglas Schiess also confirmed the nomination on social media on Wednesday.

Miller will be charged with ensuring orbital warfare capabilities are integrated with U.S. Space Command operations. He will also coordinate with the growing counterspace capabilities of other services, particularly the Army. Upon confirmation, Miller will implement the new "Space Warfighting Concept." This planning framework for conducting warfare in space was developed under Gen. Whiting's leadership.

U.S. Space Command's area of responsibility begins at 100 kilometers altitude above mean sea level and extends into outer space. The Department of Defense defined this boundary in 2020.

The command is responsible for delivering space capabilities to joint and combined forces. It also protects and defends the space domain, as outlined in official Space Force documentation.

Secretary of the Air Force Troy Meink announced that the U.S. military has on-orbit space control weapons capable of defending the joint force against hostile adversary actions. U.S. Space Command was established in 2019 as a unified combatant command under the Department of Defense, with its headquarters initially located at Peterson Space Force Base in Colorado.

What's New

Prior to his current role, Lt. Gen. Miller Jr. commanded the Space Operations Command from January 2024 to November 2025, overseeing the operational readiness and training of space forces across the U.S. U.S. Space Command was established in 2019 as a unified combatant command under the Department of Defense, with its headquarters initially located at Peterson Space Force Base in Colorado.

U.S. Space Command's responsibility includes protecting and defending the space domain, with its area of responsibility beginning at 100 kilometers altitude above mean sea level, as outlined in official Space Force documentation. In 2025, U.S. Space Command announced plans to move its headquarters from Peterson Space Force Base in Colorado to a new facility in Huntsville, Alabama, as part of a long-term strategy to enhance collaboration with defense contractors and research institutions.

U.S. Space Command officials expect to have 200 personnel, mostly from the intelligence staff, in Alabama by the end of the year. The goal is to move all 1,800 U.S. Space Command staff to a new facility in Huntsville by 2031. The U.S. Space Command's area of responsibility includes all space activities within 100 kilometers above mean sea level, as defined by the Department of Defense in 2020. One of Miller's first tasks if confirmed will be overseeing the move of U.S. Space Command headquarters from Peterson Space Force Base in Colorado to Huntsville, Alabama.

Why It Matters

The nomination places Miller at the helm of a command responsible for military operations in outer space. His immediate responsibilities include managing a major headquarters relocation and integrating new warfighting concepts. The move to Huntsville represents a strategic shift intended to deepen ties with defense industry partners.

Miller will assume command during a period of increasing focus on orbital warfare capabilities. He will coordinate with other services to ensure space assets remain protected and effective. The confirmation process in the Senate will determine when he officially takes over from Gen. Whiting.