[Bruce Campbells Chin]

That’s not quite correct. Biden joined as a Reserve Public Affairs Officer - not as a line officer. And the Navy at least does do that on occasion. It still stinks, though it actually was nepotism versus buying a commission.

[T.B. Yoits]

Very few commissions are regular commissions anymore, active duty or reserves. While the U.S. Navy Reserve Direct Commissioning Program directly commissions certain professionals under age 35 with exceptions for prior service, Hunter Biden was offering nothing they'd allow him in for, much less break the rules other than "the big guy" needed Hunter as the bag man to have a security clearance.

Jao Bai-din bought Hunter Biden's commission as directed by their Chinese and Ukrainian crime counterparts and Obama approved it.

I suspect the Navy brass so willingly threw him out a month later, not for failing his drug test (not like he'd ever pass one prior to commissioning), but because so many of the other Navy commissioned officers said they'd resign.