Well and good, but not for the benefit of the services.
Actually, unless the laws/regs have changed in the last decade, 24 MOS TIS/TIR is required for retirement at the last rank/grade held.
Governing law is Title 10 Section 1370.
https://www.law.cornell.edu/uscode/text/10/1370
O5 and higher requires 3 years but can be waived to 2 years. O4 and below is 6 months.