This paper provides the results of survey data from combat veterans on the use, training needs, and mission criticality of the Force XXI Battle Command Brigade and Below (FBCB2) digital system. The results were used to characterize FBCB2 use and to identify those procedures that are important for design of effective and efficient future training. Overall, combat veterans reported using fewer than half of the essential FBCB2 procedures in each phase of operation. Soldiers also indicated that about half of the FBCB2 procedures needed greater training emphasis and that 30% of the procedures were critical to mission success. Most importantly, the results suggested the joint contributions of training and experience on FBCB2 efficacy. FBCB2 procedures needed to be used in combat in order for efficacy to be indicated, but experience alone without formal training was not sufficient to produce the highest levels of FBCB2 efficacy. The findings also supported the idea that as people become more familiar and comfortable with digital systems, they feel better equipped to explore different functionality. In the case of FBCB2, it appeared that the more a Soldier knew about FBCB2 and the longer he employed the system, the more likely he was to learn and to use new procedures that can benefit operations.