Unit refers to
1. Any military element whose structure is prescribed by competent authority.
2. An organization title of a subdivision of a group in a task force.
3. A standard or basic quantity into which an item of supply is divided, issued, or used. Also called unit of issue.
4. With regard to Reserve Component of the Armed Forces, a selected reserve unit organized, equipped, and trained for mobilization to serve on active duty as a unit or to augment or be augmented by another unit.