Does a pretty good job explaining this(per DFAS not me)
http://www.dfas.mil/pressroom/dfasnewsreleasearchive/Release0113001.html
2013 Tax Changes for Military Personnel
January 5th, 2013 at 12:07 am
January 5th, 2013 at 12:36 am 1357346218
January 5th, 2013 at 04:04 pm 1357401855