Military forces are organized groups of personnel trained to defend a nation and its interests. They typically include branches such as the Army, Navy, Air Force, and Marines, each with specific roles and responsibilities. These forces are equipped with various weapons and technology to carry out missions, ranging from combat operations to humanitarian assistance. The primary purpose of military forces is to ensure national security and protect against external threats. They may also engage in peacekeeping missions, disaster relief, and support for civil authorities during emergencies. Military forces operate under a structured command hierarchy to maintain discipline and effectiveness in their operations.