Given the Senate's progress in confirming Trump nominees, Allvin will continue until January 2029.
Sec AF can request an officer up to 0-10 be frocked as part of the nominating process and then TAD them into the role during the process.
3.3.c.1.a in the attached.
https://www.esd.whs.mil/Portals/54/Documents/DD/issuances/dodi/133402p.pdf
If not confirmed then the frock would be rescinded and the TAD ended.
You said it, the "resistance" is the GOP, quietly blocking Trump from getting things done. No judges, no staffers if it goes through Senate confirmation.