The Synthetic Environment Core (SE Core) program is a primary provider of Terrain Databases (TDB) for the US Army's training and simulation systems. Through an open format, non-proprietary, image generator independent TDB generation process, SE Core produces terrain and models to link Live, Virtual, and Constructive domains into a common operating environment. The test and evaluation processes of these Terrain Databases for US Army virtual simulators have taken many forms over time. Until recently, this process has been disjointed and often far removed from the system level testing of the major database consumers. As a primary TDB provider for the US Army simulation and training, the SE Core program has taken steps to improve the testing process by developing the Major Evaluation of Geospatial Areas (MEGA) Review. By incorporating the test procedures of SE Core's primary virtual customers, the Close Combat Tactical Trainer (CCTT) and the Aviation Combined Arms Tactical Trainer (AVCATT), SE Core has developed an efficient test process that incorporates incremental system-level testing early on in the TDB test schedule. The new process also involves a series of set milestone review events designed to gather input from Subject Matter Experts (SMEs) and site representatives. To better understand the new process, this paper will first provide a brief historical background on test and evaluation of Program Executive Office for Simulation, Training, and Instrumentation (PEO STRI) virtual TDBs followed by its evolution into the current MEGA Review process. Additionally, the paper will present lessons learned throughout the development of this process along with the cost, schedule and performance benefits realized.