"...Retirees should not engage in personal or professional activities which are incompatible with the standards of conduct expected of active duty personnel.
It is not feasible to cover all the provisions of law which restrict the activities of retired servicemembers. If there is any doubt as to whether or not a retiree may be in violation of a particular law by accepting employment with the Federal Government or with a firm doing business with the Government, advice on the matter should be obtained from the Ethics Counselor of the organization from which you retired or at the nearest military legal office..."
