What is the best degree for future employment with an alphabet group such as DEA/FBI/CIA?

Living in the D.C. area, I can tell you that all the buzz is about Cyber Security

There is always ONE degree they all love. Accounting. Feds love asset forfeiture.

A number of Law Enforcement Officers in the Forest Service have a degree in Criminal Justice but as others have said, contact agencies you're interested in for their input.

Some type of Project Management background along with Specific interested line of Role.
These alphabetical organizations often will overlook certain qualifications depending on the primary requirements.

Master of Public Administration ...the federal government has a fast track for those with MPA's to begin as mid-level management positions regardless of agency specialization ....what they're looking for are people who can effectively manage & lead groups of people.

I have heard, and I can't verify this, that an education in political science is useful.

For DEA and FBI, a degree in Forensic Accounting would be very desirable. They need people who can work fraud and money laundering cases (as Special Agents).

If you go into Cyber or Information Security, you cant go wrong with Sec+ or a CISSP or CISM. A BA in Business or Computer Science from a regionally accred. school (emphasis on that) is good. A Master's degree always helps but make it in the field you want. I would say just don't get a degree just to have a degree. But in IT, certs are king...

Cybersecurity, Accounting or Law. If you go the JD route, I'd suggest undergrad in Cybersecurity or Accounting. Depending on which agency you choose, international studies and fluency in key foreign languages would likely help.

For getting your foot in the door, Accounting, IT and Law have all been in demand for at least the last decade. For IT, Cyber is hot and likely will be for many years. Accounting and Law will also likely be in demand in the foreseeable future.

Most importantly, you should choose a field that interests you. That passion will show while you work on your education and in your professional experiences.

You seem to have set your goal as being employed within a narrow scope of agencies. That's your main goal. Always keep that in mind. Seeking advice on which fields will help you reach that goal is the next logical step in a series of several intermediary goals you'll need to achieve to reach your main goal.

You're on the right track. Once you choose a field, stay dedicated and persevere through any challenges. Adapt and overcome and you will reach your goal. Or, you may end up somewhere you never imagined.

The choices you make now are an investment in yourself. Education will always be an excellent investment in you personal and professional growth. Keeping that main goal in focus will naturally have you achieving intermediary goals. Internships, certifications, networking, etc.

In the end that will all pay off. Anything you can do to better yourself will benefit you.

Good luck and congratulations on beginning the next chapter of your life!

Computer science and computer engineering.
If you are multi-lingual play that up, especially if the languages happen to be Russian, Farsi and Arabic