Robert Dewey (R.D.) McMillan, Jr., age 93, of Georgetown, formerly of Houston, passed away on Tuesday, December 27, 2022, in Georgetown. R.D. was born August 16, 1929, in Houston to Robert Dewey and Georgia Ullrich McMillan. On March 16, 1951, he married Shirley Smidth in Houston. He was a graduate of the University of Houston with a B.S. and a M.S. in Mechanical Engineering. He also earned a M.S.…