Operation Gyroscope was a United States Army program implemented between 1955 and 1959 during the Cold War that modified the system of troop rotation, so that entire divisions were rotated out of overseas service together, rather than individual soldiers. The program also applied to smaller non-divisional units, and was primarily used to exchange units between the United States and units in Germany under United States Army Europe. The system aimed to increase retention rates by boosting morale and unit cohesion with the added incentive of improving military family stability through keeping soldiers together for most of their careers. The program initially increased morale, but the Army was unable to keep its promises to soldiers and thus the expected benefits failed to materialize, resulting in the early termination of the program after just one of the planned-three year rotation cycles had been completed.