For example, a lower volatility stock may have an expected (average) return of 7%, with annual volatility of 5%. This would indicate returns from approximately negative 3% to positive 17% most of the time (19 times out of 20, or 95% via a two standard deviation rule).
To join the enlisted ranks, in general you must: 1  Be a U.S. citizen or Green Card holder Non-citizens must speak, read, and write English fluently. Non-citizens must currently live in the U.S. 2  Be in good health. 3  Be 17 to 40 years old (different branches have different age requirements). View a chart of age requirements by service.
Traditionally, most people join the U.S. military in their late teens or early to mid-twenties. In 2011 the average enlistment age for people joining the Army was 21.3 years. Each of the four military service branches and the Coast Guard also have their own maximum age standards for enlistment or officer commissioning.