ACE performs linear and nonlinear stress analyses using MSC Nastran finite element programs for the design of structural systems, mechanical systems, and pressure vessels for spacecraft and launch vehicle applications. Advanced dynamics tools such as random vibration analyses are also used to verify the adequacy of the design for flight and qualification test loads. Since flight pressure vessels are categorized as fracture critical, ACE performs fracture mechanics and fatigue analyses that meet MIL-STD 1522A requirements using NASGRO (NASA/FLAGRO) and other in-house software.