Best way to prepare for job in federal law enforcement after military service?

Be prepared for a long application cycle. Work on your grammar and sentence structure. Practice your interview and story telling techniques. Maintain all of your service records and start building your list of: residences, jobs, family, friends, accounts, pets, etc. Obtain a good suit.

SSG (Join to see) I would recommend using RP's advanced search option and looking for RP members in Federal Law Enforcement, request to add them under the "mentor ship and advice" option with a brief explanation and see what they can offer.

If you have the time available while on deployment, continue your studies and complete your four year degree. Most Federal LE agencies require a degree. As for preparing for a Federal LE job, the biggest question to ask yourself is which agency do you want work. There are many. The larger ones, FBI/HSI/DEA are looking for specific skills or the ability to acquire those skills. Smaller agencies may not be as busy and as some of my friends complain, downright boring. Do your research.