At the intersection of space exploration and space defense Published July 20, 2026 By Alexander Chng Space Systems Command EL SEGUNDO, Calif. -- A bright rocket soaring through the Florida sky, a live feed of the Orion spacecraft entering deep space, a glowing blue Earth framed by a spacecraft window—as the Nation pauses to commemorate National Space Exploration Day, the images of and from Artemis II are a fresh reminder of the exhilaration of human space flight. By the time the four intrepid astronauts splashed down in the Pacific Ocean on April 10th, they had traveled 252,756 miles from home—farther than any human since the Apollo era. From liftoff to splashdown, Artemis II was enabled by some of the very same technology and infrastructure that keep America’s access to space safe, reliable, and ready. This is the critical, behind-the-scenes work that the U.S. Space Force’s (USSF) Space Systems Command (SSC) supports every day through the development and delivery of the space, ground, and cyber capabilities that protect our troops and defend our Nation. But how, exactly, does the Space Force differ from NASA? The missions are complementary but not interchangeable, noted USSF Col. Andrew Menschner, deputy commander of SSC. “NASA is a civilian government agency. It explores, discovers, educates and inspires. The U.S. Space Force is a military organization,” said Menschner. “Our job is to protect our Nation’s strategic advantage in, from, and to space, defending the high ground and delivering warfighting capabilities.” While some Space Force capabilities, such as GPS, are used by Americans every day, others are more specific to space exploration and defense. These include space domain awareness, protected tactical satcom, and missile warning and tracking. But for Artemis II, the most visible intersection between the USSF and space exploration may well be the critical moments before and after launch. Space Launch Delta 45 (SLD 45), a USSF unit headquartered at Patrick Space Force Base, is responsible for critical launch functions across the Eastern Launch Range. This 10,000-mile stretch of geography extends from Florida, across the Atlantic, and into the Indian Ocean. It includes both KSC and Cape Canaveral Space Force Station, as well as all of the airspace above and a tracking station on Ascension Island that has helped guide American spaceflight since Explorer 1 in 1958. Whether exploratory, military, or commercial, the vast majority of space-bound payloads are launched from Cape Canaveral. Artemis is one of the few vehicles that launches from KSC. The two spaceports are operated cohesively, with close collaboration between KSC and SLD 45 on Artemis launches. KSC manages the mission while SLD 45 is responsible for all range functions for both sides of the Eastern Range. Scheduling and deconflicting launches, managing hazardous activities, assessing weather, and transporting rockets all fall under SLD 45’s purview, as does overall range safety, telemetry and tracking, launch timing and sequencing, launch network communications, and air and sea surveillance For Artemis II, launch preparation began well before liftoff. Flight safety analysts spent weeks plotting "hazard zones" across the range. These are the specific areas that must be evacuated to protect the public, the range, and the crew during the critical minutes of liftoff and the immediate hours following launch. "This part of the operation is handled by dedicated safety teams," noted USSF Col. Joyce Bulson, SLD 45 deputy commander. "It involves guaranteeing public safety by performing rigorous analyses that identify impacted areas in the event of a mishap. We establish and enforce 'keep out' zones across air, sea, and land for any hazardous operation, and we actively patrol those zones with assistance from the Coast Guard and NASA to prevent unauthorized incursions." Equally vital to this safety net is SLD 45’s Weather Squadron, which provides the precise data and analysis needed to ensure that launches and other hazardous operations—such as moving solid rocket motors and conducting fueling operations—can proceed safely. Weather is always one of the most critical elements factored into the final clearance decision for any launch, Bulson noted, but it was particularly crucial for Artemis II due to unpredictable wind patterns common in April, as well as the ever-present possibility of lightning. “Lightning doesn’t have to be present for a rocket to be at risk,” said Bulson. “Flying through electrically charged clouds can actually trigger a strike, a lesson we learned from both the Apollo 12 and Atlas-Centaur 67 lightning incidents. Induced lightning strikes can generate massive electrical currents and electromagnetic effects capable of disrupting avionics, triggering pyrotechnics, and ultimately destroying the vehicle.” In short, even a seemingly calm sky can pose a serious threat, making lightning avoidance a critical part of every launch decision. SLD 45’s Weather Squadron is responsible for monitoring the Lightning Launch Commit Criteria, a strict set of 10 rules that must be followed in order to prevent an induced lightning event. “The decision to keep a rocket on the pad for weather violations may frustrate spectators, but there is a lot to be said for a successful launch scrub, especially when there are four souls onboard,” said Bulson. “It's up to the Weather Squadron to monitor the environment to ensure that we don't launch into a dangerous situation.” Safety on launch day also extends to the digital realm. The 645th Cyberspace Squadron worked diligently behind the scenes, monitoring and defending the vital government networks needed for launch against potential cyberattacks to prevent costly delays or scrubs. When launch day arrived, SLD 45’s 1st Range Operations Squadron performed real-time command and control of the Eastern Range, weighing telemetry, weather, and hundreds of other variables in the final moments before liftoff. Simultaneously, the Office of Emergency Management coordinated with state and local leaders on potential contingencies; the 45th Logistics Readiness Squadron postured airfield support; and the U.S. Air Force Detachment 3’s Human Space Flight Recovery Team stood ready at Patrick Space Force Base, poised to execute rescue operations if needed. As the mission transitioned from a successful launch to anticipating splashdown, SLD 45 and its weather squadron continued to play a key role in the return flight of Artemis II. To support these recovery efforts, a team of four specialists from the 45th Weather Squadron deployed aboard the USS John P. Murtha to execute weather balloon operations, providing NASA with critical upper-air atmospheric data. This information enabled NASA to accurately forecast the trajectory of the Orion capsule as it descended into the Pacific Ocean, which allowed them to strategically position recovery ships, aircraft, and personnel outside of hazardous areas and ensure team safety during recovery operations. Following the successful retrieval of the Artemis II crew and the Orion capsule from the Pacific Ocean, Launch Weather Officers (LWOs) provided detailed forecasts for the cross-country ground transport back to Cape Canaveral, a journey that took nearly a week to complete. Because the capsule was highly sensitive to environmental conditions, the approximately 2,500-mile transit required careful planning to navigate around challenging atmospheric events along the route. “This type of mission, amidst our already busy schedule of test and launch operations, highlights the professionalism, expertise, and commitment of the men and women of SLD 45 who operate and sustain the Eastern Range,” Bulson said. “It also highlights the strong partnership between Space Launch Delta 45 and the Kennedy Space Center to make launches from the Eastern Range successful.” For Guardians, astronauts, and the general public, Artemis II was more than a launch window and a mission timeline. It was a shared human moment: four people aboard a towering technological achievement, the culmination of years of development and toil. While NASA led the mission and its crewed exploration objectives, Space Systems Command and the broader Space Force worked quietly behind the smoke and the sound to sustain, protect, and advance vital launch infrastructure. Without their silent vigilance, the historic moment could not have happened. As NASA lays plans for future Artemis missions, the Space Force will continue to provide persistent awareness, timely analysis, and coordinated support to keep crewed spaceflight safe for today and as humanity pushes farther into cislunar space and beyond.