It’s the military system of accident investigation. Everyone knew almost immediately following my first “aircraft incident” why it happened, but the military creates a board and gathers all of the information, even things that are only tangentially connected to a crash, and then reviews it all before it issues a report.

Military reports always come with recommendations of corrective actions, in addition to findings of facts.

Military aircraft don’t normally have data recorders , “black boxes”, for security reasons, so that’s a big problem for accident investigations. Because it was a training aircraft, this Sabreliner might have had them, which would speed things up, but six months is considered quick for a military investigation.