A fighting force refers to a military unit formed to engage in combat operations. Synonyms for fighting force include army, navy, air force, military, militia, troops, soldiers, warrior, combatants, and defenders. Each of these synonyms emphasizes a different aspect of a fighting force. A navy is a fighting force that specializes in sea-based operations, while an air force focuses on aerial warfare. Militia usually refers to a citizen army or a group that is mobilized for defense. Warriors and combatants refer to individuals who are trained and skilled in battle. Regardless of the synonym used, a fighting force is an essential component of any country's national defense.