Sure, the jobs exist- but you have to do a little thinking "outside the box."
Been to Iraq or Afghanistan lately? Seriously- the engineering firms that work there have lots of guys who are out on the ground, solving probs you never dreamt of! They are also training the locals to keep thing running.
Closer to home, the FAA maintains/operated the airport landing systems- everything from radar to runway lights.
How's your security clearance? Civilian contractors maintain the enormously involved instrumentation used to monitor training exercises at the various sites (such as "Top Gun" and NTC).
WHich brings up a trade group you ought to know about: ISA. The Instrumentation Society of America qualifies techs in categories that are up to Master's degree level in various control technologies. Their certifications are essential in, among other things, the pertoleum and chemical industries. They -and not the NFPA, or UL- are the real experts in hazardous locations, as an example.
