Dr. Floyd J. Malveaux, M.D., Ph.D, Executive Director of Merck Childhood Asthma Network Inc, speaks in honor of Dr. Martin Luther King Jr. birthday celebration at Joint Base Andrews, Md., Jan. 17, 2013. Malveaux urged everyone to remember King's holiday as “a day on” and “not a day off.” (U.S. Air Force photo/ Airman 1st Class Nesha Humes)