Northrop Grumman Corporation has announced the successful completion of a live, static-fire test of the stage-two solid rocket motor for the Sentinel intercontinental ballistic missile (ICBM). Conducted at the U.S. Air Force Arnold Engineering Development Complex, the test simulated high-altitude and space flight conditions in a vacuum chamber. The results, which have already been obtained, will be analyzed to compare motor performance with digitally engineered model predictions, a step that is critical for advancing the design and reducing risk. This milestone is part of the engineering, manufacturing, and development phase of the Sentinel program, which aims to modernize the United States' ground-based strategic deterrent through 2075. Following this development effort, Northrop Grumman will begin a series of qualification tests for both stages of the missile.