Other than Special Forces and Rangers, what are some other “high speed” and high specialty jobs in the Army?

I would consider all the branches including the Coast Guard. You want to be challenged, what about the Marine Corps? What are your long term career plans? Do your research, plan, set goals and then implement. Forget high speed, and go with a career that interests you and fits in with your long term plans. Once you enlist, be observant and listen closely to everything that is said. Making a mistake or two along the way is ok as long as you do not make the same mistake twice. Do not Quit!

https://www.thebalancecareers.com/marine-corps-enlisted-job-descriptions-3345341#:~:text=The%20Field%20Radio%20Operator%20%28MOS%200621%29%20is%20a,carrying%20a%20radio%20or%20operating%20the%20vehicle-mounted%20radio.

Not too sure what you mean by "high speed" jobs. There are jobs I think are in high demand in the commercial market. Information Security is a growing career field in the military services and commercial world. Many aviation and transportation career field technical skills are transferable to the civilian world, for example, being a jet engine mechanic requires transferable skills useful as a jet engine mechanic for civilian aircraft later on. All the skilled trades in the engineering career fields can be transferred to civilian life as a carpenter, welder, heavy equipment operator, etc.

No matter what career field you select you can individually be "high speed" by working with perseverance to learn the knowledge, skills, and abilities necessary to become an expert in that field. Also keeping yourself squared away in terms of military bearing, physical fitness and mental toughness. Finally, maintain you integrity.

"High speed" is a slang and sarcastic way of calling hot shot, young stud, dumb a** who think they know better and can conquer the world all by himself. At least, that is how I have used it. I would not call SF or Ranger. I call SF, Green Beret or SF, Ranger - Ranger, Airborne - troop from paratrooper. No other nickname because these guys have earned something that I wished I had the "chance" to earn. That was before 11M changed to 11B with M as special qualifier. (I weeped a little bit on the inside.)

Once you train up to be awarded an EIB, other jobs might open for you.

Get an EIB before you attempt to progress further up the chain than 11B.

Mechanized Infantry, beer, bitches and Bradleys! Mechanized warrior!

There are medical surgical teams in the Army (and the AF and Navy) that move out with little notice and to remote dangerous places around the world. They have decent life saving capability and are fairly well armed for medical folks. Mostly professional medical staff like surgeons and anesthesia with some other jobs like registered or practical nurses, medics, respiratory, OR techs, etc. Best of both worlds if you like adventure and excitement with a skill that translate in the civilian world.

Everyone wants to be high speed until it’s time to train up to be high speed.
There’s CAG or SOF-D and 160th SOAR there are also a handful of other details that individuals can be selected to augment. Those assignments are few and far between though.

There are a number of black squadrons whose existence and missions are classified. These are not on the ABN, SF and Ranger career path but those credentials will demonstrate the ability to set a high goal and succeed. If you have the skill set and motivation to win, always, you will be noticed and a candidate for a vacancy. CSM ZaGara's first sentence sums it all up.

To piggy back off of SFC Boyd, the biggest way to put a target on your back in any training is come in talking big, acting tough, or taking about what you are going to do after you have passed. If I am cadre running a school and I hear or see that crap I am going to set you in your place. The numbers say that regardless of who you are, you will either get hurt or fail almost half the time.

If you wanna do great things, start small like he said. Every single day show up to excel and press your leadership to invest in you and THEN show them why they should. Keep your head down, do what the heck you are told, and don’t be late.

The brass will always ask who among the new guys is a good pick for training and school. Make their choice easy.

Join the Marine Corps, they’ll get you ready for high speed.