how long is military deployment
Typical US Army deployments to conflict zones (Afghanistan, Korea, Bosnia, etc.) are one year, but commonly range anywhere between 6-18 months depending on the assigned mission and the levels of theatre deployment ready troops. Deployments under 6 months are rare across the board but do happen in done circumstances. I haven't heard of anything longer than 18 months, unless you count back to back deployments, but with the drawdown I doubt that's an issue anymore.