Group means two or more people who interact to accomplish individual or mutual goals.
Definition 2.
Group refers to
1. A flexible administrative and tactical unit composed of either two or more battalions or two or more squadrons.
2. A number of ships and/or aircraft, normally a subdivision of a force, assigned for a specific purpose.
3. A long-standing functional organization that is formed to support a broad function within a joint force commander’s headquarters. Also called GP.