Someone in a position of authority mandate one process. Make a Secret investigation done by the DoD transferable for a Secret in ANY OTHER government entity. If agencies require different levels of detail for a Top Secret, make the process such that any any agency requiring a TS can take a TS. If a TS w/poly is required it is the same standard for any TS w/poly. I fully understand that a person requiring a TS must be vetted more stringently than a secret, but it is a waste of resources to redo an investigation in that is less than 5 years old if the Federal Employee changes jobs within the government.
Have the process developed for investigations from FOUS up to the highest level of TS/SCI full scope poly. And make those transferable within the Govenment.