http://www.comw.org/qdr/fulltext/100223williams.pdf
> Growth in Budgets for Military Health Care
> The DoD's health care costs rose from about $20 billion in 1998 to $47 billion in 2010 (FY 2010 dollars)—an annual growth rate of 7.4 percent above inflation. Absent changes in policy, CBO projects they will at least double between now and 2028.
It's no sale because it's ~2% of the budget masked in emotion, which is at best an irrelevant distraction and at worst a deliberate attempt to demonize opposing views.
Limit the focus to just the (increasingly ill-named) "defense" budget and even then it's only around 10% and is dwarfed by the cost of discretionary operations within that budget/department.