Unmanned Aerial Vehicles : Dod's Demonstration Approach Has Improved Project Outcomes: Nsiad-99-33 download pdf. GAO reviewed the Unmanned Aerial Vehicles (UAV) projects to determine whether the Department of Defense's (DOD) strategy of conducting Advanced Concept Technology Demonstrations (ACTD) before developing and producing UAVs provides an improved knowledge base for making acquisition decisions.GAO noted that: (1) the ACTD strategy of focusing on mature technology and proving