Gather all of your experiences... from your military career to the present. Carriers require a 10 year work history for the background checks. HR, usually, reviews and discusses your history from day 1. That said, construct a resume. There are specialists available that can assist you in designing your resume, and advise you on completing your applications. The last 10 years of information on the resume and application needs to match.

Good luck and welcome back to the fun.