In November 1976, both designs were transferred to Edwards Air Force Base for head-to-head testing, including lifting heavy loads like tanks and artillery from dirt airfields at Graham Ranch, off the end of Runway 22.
Pada bulan November 1976 kedua rancangan telah dipindahkan ke Edwards Air Force Base untuk pengujian kepala-ke-kepala, termasuk pengangkutan beban berat seperti tank dan artileri dari landasan tanah Graham Ranch, Runway 22.