A Fire Controlman 2nd class, Gilbert was stationed on the USS Oklahoma after joining the Navy from Indiana, according to a profile page on the Defense POW/MIA Accounting Agency (DPAA) website. The agency's mission is to recover US military personnel and identify them using a combination of forensic science technology and military records.
Personnel at the Defense POW/MIA Accounting Agency (DPAA) used procedures including dental, anthropological and mitochondrial DNA analysis to identify Gilbrt's remains.
You can read more on CNN.com at: https://www.cnn.com/2022/06/07/us/george-gilbert-sailor-pearl-harbor-national-cemetery-pacific/index.html