Bone and cartilage are types of connective tissues in the body. A bone is hard tissue that forms the skeletal structure of the body. Cartilage, by comparison, is not as hard and rigid as bone, and is present in areas of the body like the ear, nose, and joints.
A waiver is the voluntary relinquishment or surrender of some known right or privilege. Regulatory agencies or governments may issue waivers to exempt companies from certain regulations. For example, a United States law restricted the size of banks, but when banks exceeded these sizes, they obtained waivers.
A: PERS 913 adjudicates RE-4 waivers on a case by case basis. An RE-4 reenlistment code simply means that a BUPERS waiver is required prior to approving an enlistment to join the SELRES. Waivers may be obtained by submitting a request to PERS-913 via the Navy Reserve Recruiting Command.