"...Generally, there is no reduction of Social Security benefits because of your military retirement benefits. You'll get your full Social Security benefit based on your earnings.
Social Security survivors benefits may affect benefits payable under the optional Department of Defense Survivors Benefit Plan. Check with the Department of Defense or your military retirement advisor for more information.
If you have health care protection from the Department of Veterans Affairs (VA) or under the TRICARE (formerly CHAMPUS) or CHAMPVA program, your health benefits may change or end when you become eligible for Medicare. You should contact the VA, the Department of Defense or a military health benefits advisor for more information..."