general casey called the risk moderate, but -- >> that said, if repeal is directed, the implementation principles in the report constitute a solid basis upon which to develop plans that will mitigate the risks that i just described. properly implemented, i do not envision that the repeal of don't ask don't tell would keep us from accomplishing our worldwide missions, including combat operations. >> committee chairman carl levin amplifying general casey's point about implementation specified in the language of the bill to repeal it now before the senate. >> if we repeal don't ask don't tell, as i believe we should, the legislation stipulates that repeal will not take effect unless and until there is a certification by the president, secretary of defense, and the chairman of the joint chiefs.