The Department of Defense (DOD) is experiencing a growing demand for intelligence, surveillance, and reconnaissance (ISR) assets to provide vital information in support of military operations. Over the next 7 years, DOD plans to invest over $28 billion in existing and new airborne ISR acquisition systems. This represents a marked increase over prior ISR investments. Given the significant investments, GAO was asked to (1) evaluate various ISR platforms for potential synergies and assess their cost and schedule status and the impact of any increases or delays on legacy systems and (2) assess the effectiveness of ISR investment decisions. To assess cost and schedule status, we reviewed programmatic and budget documentation. To evaluate investment decisions, we collected data on system capability, mission, and concept of operation and analyzed them for similarities.