Group leaders should be called under the following circumstances:

• When a military base has units with a wartime mission that could require personnel to deploy on short notice. In such instances, the group leader should be called and trained before he is deployed; doing so after deployment is generally not feasible. Since it is unlikely that an entire base would deploy together, group leaders should be called for each military unit where Church members are assigned.
• When there is no established ward or branch that meets on the military installation and military members are restricted to the base. This is usually the case with new recruits attending basic and advanced training. In such instances, a group leader should be called to oversee the Church programs.