I found a few sites that some may find helpful in getting the military to either extend reimbursement for traveling expenses, or paying for expenses after you have moved, if you waited for longer than a year to move after being medically retired. I hope this helps! I'm in a position where I'll be trying to extend reimbursement for another year, so I'll let everyone know how easy or difficult the process was for me.
http://www.militaryavenue.com/ArticleView.aspx?ArticleID=24718
http://www.military.com/Opinions/0,,Johnson_080805,00.html
DD Form 149
http://www.militaryavenue.com/ArticleView.aspx?ArticleID=24718
http://www.military.com/Opinions/0,,Johnson_080805,00.html
DD Form 149