How do you put S3 on a civilian resume?

"Directly responsible for managing training schedule and personnel. Determined organizational needs in conjunction with senior leadership to advance corporate and individual needs. Assess training gaps and take corrective action....etc..."

Briefly explain your responsibilities and accomplishments. Exactly what you call the job isn't as important as what you did while you held it. Civilians don't get overly hung up on job titles because they can change with each new set of corporate managers. The S3 can easily be translated to Director of Operations, or Chief Operating Officer. As a subordinate of that person, you might be called the Training Manager or Training Supervisor. Keep it simple. Civilian employers aren't dumb and most will recognize you're trying to translate military experience into civilian terms. They might even ask in an interview what your military rank and jobs were. As an E-5, you will probably be viewed as a "supervisor" at the operating level.

Remember military terms is how we talk. It is not how civilians read. Try and describe your work in civilian terms. Send me your email and can send you an example.

"Experienced training and operations manager for over 300 employees"
"Planned and implemented annual training for...."
"Planned and executed 37 international training events involving 17 partnered nations"

... or something along those lines. Just try to avoid military terminology and acronyms.

Good afternoon, I'm sure you have or not, but try VMET.