To authorize the Secretary of Defense to pay an additional amount of assignment special pay to members of the Armed Forces who agree to serve in Afghanistan for up to six years or the duration of the United States mission in that country.

Authorizes the payment of assignment pay in a total amount of $250,000 to members of the armed forces who agree to serve on active duty in Afghanistan for six years or for the duration of the U.S. mission in Afghanistan, whichever occurs first. Provides for an increase in the amount of such pay if such a member scores a 4.0 on the Foreign Service Institute test for the dominant languages of Pashto and Dari.