H.R. 4372 tightens oversight of Defense Department spending on major weapons systems by requiring faster reporting of cost overruns and imposing stricter consequences for repeated budget failures. Specifically, the bill shortens the timeline for reporting cost breaches from indefinite periods to 30 days, requires the Pentagon to publicly disclose all cost overrun reports online, and mandates automatic termination of any weapons program that experiences a second major cost increase within 90 days unless the Secretary of Defense personally certifies it should continue. The legislation also expands cost tracking requirements to include operations and support expenses over a program's entire life cycle, not just development costs, and requires designation of expensive subcomponents as separate programs for individual accountability. This bill affects the Pentagon and military contractors developing large weapons systems, with no specific new funding required since it primarily adds reporting and management rules to existing acquisition law.