If you zoom out historically, the “most transferable” military roles have usually been the ones tied to state capacity: administration, engineering, logistics, communications, and medicine. The Roman legions exported surveyors and road-builders; Napoleonic armies professionalized staff work; WWII and the Cold War pushed massive technical pipelines (signals, radar, maintenance, supply).
In modern terms, the civilian-friendly lanes are: logistics/supply chain (planning, inventory control, movement), signals/IT (networking, radios, cybersecurity), engineering/construction (utilities, vertical/horizontal construction, surveying), intelligence analysis (with caveats about clearance and how much you can discuss), and maintenance trades (aviation, power generation, vehicles).
A useful lens: pick an MOS/rate where the “toolbox” is the same in and out of uniform (diagnostics, schematics, quality control, documentation). The more your job relies on doctrine-specific tasks without an equivalent industry standard, the harder the translation. Think in terms of recognizable frameworks—project management, ISO-style maintenance practices, and formal certifications.
If you want reading that helps frame this: Martin van Creveld’s work on logistics and the way WWII histories describe training pipelines for radar/maintenance are good reminders that technical education has always been the long-term “dividend” of military service.