Sentence 1: Dr. Irwin , a U.S. Air Force orthopedic surgeon , was instrumental in preventing the amputation of John Forrest 's leg .
Sentence 2: Dr. Irwin , an orthopedic surgeon of the U.S. Air Force , was instrumental in preventing the amputation of John Forrest 's leg .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?