This regulation prescribes policy, procedures, and responsibilities to train Reserve Component units based in the continental United States, and U.S. territories or possessions in a training status. RC units execute overseas deployment training primarily to improve their mission readiness; however, RC units conducting ODT also fulfill capability requirement shortfalls for an Army service component command’s theater engagement, security cooperation, forward presence, stabilization, and mission support activities. The combat support and combat service support capabilities, setting the theater, and sustaining it, are critical. ODT can provide the opportunity for RC forces to train and operate in a Joint context. The Army must be ready to execute and sustain operations across the full spectrum of operations in the contemporary operating environment. RC units participating in ODT should look for opportunities to train to the full spectrum of operations.