The 'Perform to Serve' (PTS) program is a Navy tool for managing sailor reenlistment eligibility, specifically for E3-E6 personnel with less than 14 years of service. Key updates include a 13-month application window and the requirement for commands to submit evaluations when processing applications. Sailors must have an approved PTS reservation and meet certain criteria and deadlines to qualify for reenlistment or conversion to a different rate.