Sentence 1: At 10 : 59 AM the last ship element of the 2nd Battalion 4th Marines left the zone and the last helicopter landed at 12 : 15 on the USS `` Okinawa '' .
Sentence 2: At 10 : 59 , the last marine element of 2nd Battalion 4th Marines left the zone and the last helicopter landed on the USS `` Okinawa '' at 12 : 15 .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?