In 1987, Congress ordered the Selective Service System to put in place a system capable of drafting "persons qualified for practice or employment in a health care occupation" in case such a special-skills draft should be ordered by Congress. In response, the Selective Service published plans for the "Health Care Personnel Delivery System" (HCPDS) in 1989, and has had them ready ever since. The concept underwent a preliminary field exercise in Fiscal Year 1998, followed by a more extensive nationwide readiness exercise in Fiscal Year 1999. The HCPDS plans include women and men age 20–54 in 57 job categories.