STO selection is a two-phase process. Beginning with Phase One, a board of veteran STOs reviews application packages consisting of letters of recommendation, fitness test scores, and narratives written by the applicants describing their career aspirations and reasons for applying. Based on Phase One performance, about eight to 10 applicants are invited to the next phase. Phase Two is a weeklong battery of evaluations, ranging from physical fitness and leadership to emotional intelligence and personality indicators. At the end of Phase Two, typically two to four applicants are selected to begin the year-plus Special Tactics training pipeline.