The optimal training of physicians should prepare them for the environment in which they will practice. During the past several years, the practice of internal medicine has shifted from a focus on the inpatient setting to one that includes an emphasis on the ambulatory clinic. Military internists must be further prepared to practice medicine with forward units, at field hospitals, and in other operational settings. Community-based teaching programs that reflect present and future practice are increasingly recognized as essential, yet details on the structure and implementation of such programs, especially those designed to teach field and operational medicine, are lacking. The Internal Medicine Residency Program at Walter Reed Army Medical Center has developed and implemented an operational medicine curriculum that includes a field medical training exercise. The program is driven by the residents and chief resident and requires little additional funding. Resident research continues to increase, morale remains high, and the first class to complete the 3-year operational curriculum achieved a 100% pass rate on the American Board of Internal Medicine certification examination. We describe our 3-year experience of implementing this program, with an emphasis on curriculum design and execution, qualitative assessment, and initial lessons learned.