Whats the best MOS for a high school graduate that can lead to a good civilian salary?

Good rule of thumb is the length of the school. The more the military pays to train the more valuable that training and your experience will be.

For a civilian afterlife, hard to beat avionics, helicopter repair, electronics troubleshoot, diagnostics.
Exacting, precision work.
Highly rewarding, good income.
If you are considering a career, leadership, command will yield great career opportunities following 20 years.
I was a communications tech and led to jobs that allowed me to travel all over Europ, Asia and the States.

If you are joining to make a great life in civie world, then you are joining or the wrong reasons. Thatbeing side, probably a technical MOS.

i got out in 2014 i have sporadic patches and skin inflammation. I received t 6 different rounds of the Anthrax vaccines God knows what's in the cocktail i call my blood stream .

Jet engine repair in air force or marines or navy. Also nuke power systems repair in navy...

NOT JOINING!!! You serve to serve, not reaps rewards. I had SVN USMC grunts, get out become a bank VP, and came back into the 82nd ABN DIV as a combat medic. Education, unless you get a technical field is the key on civilian life.

Engineers. I say Hooah

11b

Aviation or medical

155E, Fixed Wing Pilot. High School to Flight School. Fly Army and Be All You Can Be!