Operation Gyroscope was a United States Army program implemented between 1955 and 1959 during the Cold War that modified the replacement system so that entire divisions were rotated out of overseas service together rather than as individuals. The program also applied to smaller nondivisional units, and was primarily used to exchange units between the United States and forces stationed 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 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.
Background
Retention problems
Following the end of the Korean War, the United States Army found itself facing massive retention problems, failing to retain experienced enlisted soldiers in service due to the army being comparatively unattractive compared to civilian careers. Manpower requirements could be filled by the draftees of the Selective Service System, but they had only a two-year service obligation and little incentive to remain in the army, and even those who enlisted voluntarily did not re-enlist in quantities high enough to meet the demands of the army. The issues of retention especially affected specialized branches that required advanced training such as radar technicians, aircraft mechanics, and signal troops.
Retention problems further increased instability and inefficiency within the army, as every year large quantities of replacements needed to be trained and sent to their permanent duty stations in order to compensate for the equally vast numbers of those returning for discharge. As a result of the manpower shortage, in 1954, a career soldier might have only six months stateside between foreign tours, and there were units with 70% personnel turnover. The situation was exemplified by the 25th Infantry Division in Hawaii, where in 1954 and 1955 the division was short by at least 1,000 personnel and had 4,000 soldiers nominally on the rolls but in fact either transferring into or out of the unit, in addition to having only 108 out of 882 authorized officers. Such turbulence made it difficult to train and as a result its commander described the situation as essentially "garrison duty." High personnel turnover was inherent in the individual replacement system used by the army, leading to a complete change in unit personnel over three years. The individual replacement system thus required the Army to maintain excess manpower to compensate for soldiers in transit between stations and low retention rates.
In an attempt to solve the retention problem, senior army officers sought a solution in the replacement of the individual replacement system with one based on unit rotation. Before World War II, soldiers would spend their entire careers in the same unit, thus creating a "surrogate family" that generated strong esprit de corps and motivated soldiers to remain in the service. However, the wartime manpower needs of the war forced a move to an individual training and replacement system that was effective at meeting wartime manpower requirements but detrimental to peacetime needs. By the end of the Korean War, the system was criticized in the army as damaging to morale, unit cohesion, and combat effectiveness, with one report to Army Chief of Staff General Matthew Ridgway declaring that the replacement system reduced "the individual soldier to the same status as a piece of equipment which is moved from place to place according to his MOS whenever a blank file exists." The report blamed the system for reducing discipline in combat, which it argued was the cause of the perceived unsatisfactory conduct and even defection of some American prisoners of war in Korea. Furthermore, polls of officers and enlisted men leaving the army reinforced the conclusions of Chief of Army Field Forces Lieutenant General John E. Dahlquist that "instability of assignments" and too frequent overseas deployments were barriers to retention. Since 1941, career soldiers and military families had lived a transitory existence unable to reconcile long-term plans with the army, "never secure enough to buy a house, plan their children's education. or put down roots in the community."