The U.S. Air Force 452nd Flight Test Squadron marked the completion of its RQ-4 Global Hawk flight test program Friday with a sunsetting event at Edwards Air Force Base in California.

Guest speakers from the Air Force and Northrop Grumman gave insight into the Global Hawk’s test campaign history and legacy. There was also a Q&A panel featuring RQ-4 operators, who spoke about the Global Hawk’s mission in real-world operational scenarios, according to a Tuesday Edwards AFB news release.

“The RQ-4 joins the likes of the X-1, the X-15, and the XB-70 as boundary breakers and record setters,” Maj. Mark Johnson, the RQ-4 test team lead, said in the statement. “Much like these well-known aircraft, the RQ-4 was indeed an experimental aircraft and one that challenged aviation standards. In its time, the RQ-4 introduced us to new concepts, new capabilities, and new challenges. No longer were pilots constrained by flight duty period and fatigue, nor were aircraft constrained by landing visibility.”

Even with the conclusion of the Global Hawk test campaign, the RQ-4’s Global Vigilance mission is ongoing. Production and flight test on the aircraft family continue, as it is anticipated to serve the U.S. and allied partner nations in a multitude of ways in the coming decades, according to the release.

The RQ-4 Global Hawk is a high-altitude, long-endurance, remotely piloted aircraft with an integrated sensor suite that provides global all-weather, day or night intelligence, surveillance and reconnaissance (ISR) capability, according to the Air Force.