William B. Roper Jr. is an American physicist and foreign policy strategist who served as the 13th Assistant Secretary of the Air Force for Acquisition, Technology and Logistics, overseeing procurement for the U.S. Air Force and Space Force from 2018 to 2021. Before taking office he served elsewhere within the Department of Defense as founder and director of the Strategic Capabilities Office, and prior as Ballistic Missile Defense System Architect at the Missile Defense Agency. He was also a member of the 2018 National Defense Strategy steering group. He is currently the CEO at Istari, as well as serving as senior advisor at McKinsey and Co., and teaching at Georgia Tech.
Official portrait, 2019
Roper reviewing a Joint Tactical Aerial Resupply Vehicle concept at Aberdeen Proving Ground in 2017.
Roper with Secretary of the Air Force Barbara Barrett and Elon Musk
Roper donning a pressurized flight suit for a flight in the U-2 Dragon Lady
The Space Development Agency (SDA) is a United States Space Force direct-reporting unit tasked with deploying disruptive space technology. A primary focus is space-based missile defense using large global satellite constellations made up of industry-procured low-cost satellites. The SDA has been managed by the United States Space Force since October 2022. By February 2024 the SDA had 33 satellites on orbit. SDA intends to have at least 1,000 satellites in low Earth orbit by 2026.
Space Development Agency
Rapid Reaction Launch Proliferated Ground C2 for the NDSA (National defense space architecture) of the Space Development Agency
Earth's satellites in: Low Earth orbit— LEO (blue); Medium Earth orbit— MEO (green); Cislunar distances (red): If one were to hold a blue marble out at arm's length, one would see Earth's size and shape from the perspective of the astronauts travelling to the Moon.
Image: Fred G. Kennedy III
