Global Hawk? Would you buy a car you can only drive a few days a week? Read the GH Operational Test & Evaluation report, which states “The RQ-4B Global Hawk Block 30 air vehicle fault detection and indication system ... is not effective for post-flight maintenance fault isolation. Air Force maintenance personnel are unable to evaluate the large number of presented fault codes to identify specific system failures.” The recommended redesign was “Resolve deficiencies in air vehicle and ASIP integrated diagnostic and health monitoring systems” Not implemented. Effective Time On Station was found to be 27% .