Trump’s Space Force Bill: $1 Billion for X-37B Space Plane
X-37B: The Mysterious Space Plane’s Mission Roster and Cutting-Edge Technologies
The U.S.space Force’s X-37B Orbital Test Vehicle (OTV) is a marvel of aerospace engineering, a reusable robotic spacecraft that has been quietly conducting missions in orbit for over a decade. Its enigmatic nature and advanced capabilities have fueled speculation, but its primary role is as a crucial on-orbit testbed for new technologies and a platform for understanding space operations.
The most recent mission, OTV-7, launched on December 28, 2023, and concluded on March 7, 2025, after an extraordinary 434 days in orbit. This latest deployment continues the legacy of the X-37B as a vital asset for the Space Force.
A Look Back: The X-37B Flight Roster
The X-37B has a distinguished history of triumphant missions, each pushing the boundaries of what’s possible in space. Here’s a breakdown of its orbital endeavors:
OTV-1: Launched on April 22, 2010, and landed on December 3, 2010, completing a mission of over 224 days.
OTV-2: Launched on March 5, 2011, and landed on June 16, 2012, spending an extended period of over 468 days in orbit. OTV-3: Launched on December 11, 2012, and landed on October 17, 2014, marking a significant duration of over 674 days on-orbit.
OTV-4: Launched on May 20, 2015, and landed on May 7, 2015, achieving a remarkable nearly 718 days in space.
OTV-5: Launched on September 7, 2017, and landed on October 27, 2019, setting a new record with nearly 780 days on-orbit.
OTV-6: Launched on May 17, 2020, and landed on November 12, 2022, demonstrating astonishing endurance with 908 days circling the Earth.
OTV-7: Launched on December 28, 2023, and touched down on March 7, 2025, completing a mission of 434 days.
Pioneering Technologies: What Makes the X-37B Special?
The X-37B is not just another spacecraft; its a platform for innovation, incorporating several “first use in space” technologies developed by its builder, Boeing. These advancements are key to its operational success and its role as a testbed:
Automated Avionics: The vehicle features avionics specifically designed to automate all de-orbit and landing functions, ensuring precision and safety.
Electro-Mechanical actuation: In a significant departure from traditional designs, the X-37B utilizes flight controls and brakes that rely entirely on electro-mechanical actuation, eliminating the need for onboard hydraulics.
Lightweight Composite Structure: To enhance performance and efficiency, the spacecraft employs a lighter composite structure, a modern choice to conventional aluminum.
Advanced Thermal Protection: The X-37B is equipped with new-generation high-temperature wing leading-edge tiles, including toughened uni-piece fibrous refractory oxidation-resistant ceramic (TUFROC) tiles, and advanced conformal reusable insulation (CRI) blankets. These materials are crucial for withstanding the extreme conditions of re-entry.
According to aviation week & Space Technology*,the Space Force leverages the X-37B system as an on-orbit testbed. this allows them to experiment with new technologies, gain a deeper understanding of similar adversarial platforms, and develop new training environments. chief of Space Operations General Chance Saltzman highlighted these objectives in comments to the publication in January.
The X-37B continues to be a vital component of the U.S. Space Force’s strategic capabilities, pushing the envelope of space technology and operations with each successful mission.