re: #3 Eclectic Cyborg

As so many others have noted - omissions on SF-86 can result in revocation of security clearance plus criminal charges, dishonorable discharge, etc., depending on who is involved (civilian vs military).

A military official who lies by omission on the form? Dishonorable discharge, plus potential criminal charges.

A Trump official? So far, not a goddamned thing and that’s applicable to Sessions and Kushner. Who knows who else at this point too - like say - Pence.

Of course, the simplest answer to all this is IOKIYAR.