Approximately 26,000 citizen soldiers, sailors, and airmen and women, trained to the level of and interchangeable with their Regular Force counterparts, and posted to CAF operations or duties on a casual or ongoing basis, make up the Primary Reserve. This group is represented, though not commanded, at NDHQ by the Chief of Reserves and Cadets, who is usually a major general or rear admiral, and is divided into four components that are each operationally and administratively responsible to its corresponding environmental command in the Regular Force – the Naval Reserve (NAVRES), Land Force Reserve (LFR), and Air Reserve (AIRRES) – in addition to one force that does not fall under an environmental command, the Health Services Reserve under the Canadian Forces Health Services Group.