I've been in the Cyber-Security field, in the Defense Industry, almost 15 yrs. My actual job title is Lead Technical Engineer - Information Assurance. Interestingly enough I do not have a degree in this field, but I have the required experience and certification. In the defense industry you can have a degree, but they are also requiring a certification, the most popular being CISSP, and yes this is the certification I have. This is why I can make a 6 figure income, have no problem finding a job and I don't have the student loans to pay.
I travel all over and will admit I completely enjoy the work I do and find it very rewarding.
Most jobs in this category, in the Defense Industry, will require a clearance. They do a complete background, credit check, and polygraph. If you have a clearance + you go through a background and poly every 5 years. If something comes up in either of these you can/will lose your clearance, and your job.
Many of us in this field have been doing this for many years and find it interesting how this "job class" is growing now that it is being taken more seriously.
All groups "Agencies" in the Government have specialists (SME - Subject Matter Experts) in this field. So there are plenty of job opportunities if you can meet the mandatory requirements.
The previous poster mentioned NSA and they are only one of many groups in the Defense Industry/Government.