law and overturn don't ask don't tell. >> at this point, not withstanding the result the study will bring forward my best military advice to the committee, secretary and president is keep it as it is. >> reporter: earlier in week the air force chief of staff general norman schwartz said now is not the time to pretush the force. >> i do have serious concerns about the impact of the repeat of law that has been at war for eight-and-a-half years. we don't know the impacts on the readiness and military effectiveness. >> defense secretary gates and chairman of joints chief support comprehensive review due by the end of the year how to implement a change and what effects it might have. today, the pentagon press secretary tried to down play