Concepts inOSI Group Communication Support for a date planning application
Group (military aviation unit)
A group is a military aviation unit, a component of military organization and a military formation. Usage of the terms group and wing differ from one country to another, as well as different branches of a defence force, in some cases. Groups therefore vary considerably in size. In most air services and most countries, a group is made up of two to four squadrons and is commanded by a Lieutenant Colonel, Commander or similar ranks.
more from Wikipedia