The overall plan devised to defeat an enemy is called strategy. The actual techniques carried out against the enemy are tactics, which consist of the procedures for winning on the battlefield, in naval battle, and in aerial combat. Once the overall strategic plan has been approved, planning cycles at lower echelons are implemented. The execution of plans, making possible the attainment of military objectives, involves functions carried out by a field commander whose tactical judgment and leadership are critical. Logistics, which involves transporting troops and furnishing continuous supplies in support of military operations, is essential to the success of the mission. Mobilizing industry, utilities, and medical service, as well as scientific research facilities and propaganda sources, are also part of the logistics planning process.