his attempt to regain control. The accident investigation found that the ground controllers had elected not to monitor in real time the attitude thrusters that controlled the vehicle's yaw motion, and, at the velocity Algranti was flying, the thrusters had been overpowered by the LLTV's aerodynamic forces, causing Algranti to lose control. Due to tight cost constraints on the LLRV and LLTV, wind tunnel testing had been avoided in favor of careful flight testing for evaluation of the vehicles' aerodynamic characteristics. After reviewing the results of the crash investigation, however, it was decided that the third LLTV be loaded into NASA's Super Guppy and flown to the Langley Research Center in Virginia for testing in its full-scale wind tunnel. Testing was initiated on January 7, 1968 and ended one month later on February 7. It was quickly determined that the cause of the divergence was the Styrofoam cockpit enclosure. As the vehicle's sideslip angle reached minus two degrees, a yawing force rapidly built up that exceeded the ability of the yaw thrusters to counteract. The fix decided on was simply to remove the top of the enclosure, thus venting it and eliminating the excessive yawing force. It was also possible from the wind tunnel results to develop a preliminary flight envelope for the LLTV, defining its allowable maximum airspeed at various angles of angle of attack and sideslip. All this had to be verified by flight test, however, since it was not possible in the tunnel to obtain good data with the engine running. A high level LLTV Flight Readiness Review Board was appointed on March 5, 1969 by JSC Director Dr. Robert Gilruth. It consisted of him as chairman, with board members Chris Kraft, head of Mission Operations; George Low, head of JSC's Apollo Program; Max Faget, JSC's Director of Engineering and astronaut Deke Slayton, Director of Flight Crew Operations. The board reviewed the wind tunnel results, and on March 30 gave approval for the resumption of test flights in LLTV#2. The test program of 18 flights, all flown by H.E. Ream, was successfully completed on June 2. Hence, in the month before the Apollo 11 launch Armstrong was able to complete his LLTV flight training. He commented after his return: In Armstrong's 2005 authorized biography First Man: The Life of Neil A. Armstrong, astronaut Bill Anders is quoted as describing the LLTV as "a much unsung hero of