This is a case study of fielding and employment of the M2 Bradley Fighting Vehicle to anticipate potential training challenges of the K21 Infantry Fighting Vehicle fielded units, and to find possible solutions for them. By analyzing the various literatures about the training challenges of the M2 Bradley Fighting Vehicle units, the study found 21 important training challenges which are potential training challenges of the K21 Infantry Fighting Vehicle units. Then, the 21 training challenges were logically grouped into five categories: training doctrine, mounted gunnery training, dismounted infantry training, training support, and leader training. After that, the study prioritized these five categories of training challenges based on the analysis of the literature review and the interviews with subject matter experts. As a result, it identified three salient training challenges which are directly related to the K21 IFV units: training doctrine, mounted gunnery training, and dismounted infantry training. Finally, the study analyzed these salient training challenges more in-depth, and suggested possible solutions for them.