Military forces are organized groups of personnel trained for warfare and defense. 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 protect a nation's interests and maintain security. Military forces can be deployed for various purposes, including combat operations, peacekeeping missions, and humanitarian assistance. They play a crucial role in national defense and can also collaborate with international organizations like the United Nations to address global security challenges.