Moreover, the repetition of combat tasks during the rehearsal leaves a lasting mental picture of the sequence of key actions within the operation. Rehearsals also provide a forum for subordinate units and leaders to analyze the tactical plan to ascertain its feasibility, common sense, and the adequacy of its command and control measures before it is too late. To be effectively and efficiently employed in combat, rehearsals must become habitual in training. All units at every level should routinely train and practice a variety of rehearsal techniques. Local SOPs should identify appropriate rehearsal techniques and standards for their execution.
Time is probably the most precious resource available to commanders and units.
Rehearsals take time. The time required for rehearsal varies with the complexity of the task to be rehearsed, the type of rehearsal, and the level of participation. For this reason, the emphasis on rehearsals should be at the lowest level possible, using the most thorough technique given the time available. See FM 101-5 for more details on rehearsals. One convention is to identify levels with numbers and participation with letters.