US Army Training and Doctrine Command (TRADOC) has launched the Army USMAP. Soldiers now have the opportunity to improve their job skills and to complete their civilian apprenticeship requirements while on active duty. The national recognition in the form of a Department of Labor certificate of completion lasts for a lifetime and assists in post-service employment. To get started, check out the USMAP website.
Once there, click on the Trades tab in the top navigation, then click on the "Army Military Occupational Specialty (MOS) codes" link towards the bottom of the page to see the available trades.