Time to tell on myself a bit, I was a 35N in the US army with experience adjacent to this subject. Stingrays are commercially available devices that pretty much anybody with big money can get their hands on and use. Private companies make various stingray-type devices and those private companies have salesmen who actively want to sell YOU on buying their equipment.
For law enforcement, getting a continuing agreement with telecommunication companies to have legal access to bulk USP data is a big nightmare with lots of red tape. Even if a police department were to get these agreements with the telecommunications company you’re now introducing all of the inconvenience of dealing with AT&T customer support to get your data from them. This isn’t a joke, pretty often you will still have to work with/through the telecommunications company you have an agreement with to get your data. And to be honest their techs and reps are dumb as bricks, they are so often a common pain point.
Setting up a stingray on the other hand gives the police department direct access to all the data themselves with no middle-men, and often they even have supplemental support from whichever company they bought their stingrays from. It’s easier, faster, and more convenient data collection 99% of the time to not go through the genuine cell towers.
For a real answer here’s roughly what DOD contracting makes.
With a degree you can probably start around $125k-$160k a year. Without a degree or experience I’ve seen people start as low as $78k a year, and as high as $115k a year. It all really depends on how much funding the contract you work for has.
5 years in experience, training, certs, whatever else there are people making anywhere from $180k-$250k.
10+ years in, $300k+. At this point you’re likely specialized in something through experience alone and can barter your salary to whatever since you might be the only person available for any given position. The pool of people who work in intelligence is small, I saw an RF engineer haggle their way up to $550k a year for a technical position.