United Launch Alliance's Vulcan launch vehicle remains grounded after experiencing a solid rocket booster anomaly during a mission last month, preventing the company from fulfilling a scheduled US military satellite deployment.

The grounding has left ULA unable to deliver critical launch services when the US military requires satellite capabilities in orbit, highlighting ongoing reliability concerns with the new rocket system. The Vulcan rocket was designed to replace ULA's Atlas V and Delta IV vehicles and serve as a primary launch provider for national security missions.

The solid rocket booster issue occurred during a recent Vulcan mission, though specific details about the nature of the anomaly have not been fully disclosed. ULA and relevant authorities are investigating the incident to determine the root cause and necessary corrective measures.

The delay comes at a time when space-based capabilities are increasingly critical for national security operations. Military satellites provide essential services including communications, navigation, surveillance, and missile warning systems that support both defense and civilian infrastructure.

ULA has not announced a timeline for when Vulcan flights might resume, pending completion of the investigation and any required design modifications or procedural changes. The company faces pressure to restore launch capabilities quickly to meet its commitments under military launch contracts.