My grandfather died when I was real young, so I never was able to really have a relationship with him. He was in VMSB 234, other than what is online I know very little. Is there a government agency with information on where he was stationed during the war?
This page on the AskHistorians wiki should have all the details you need to know. As an American, you'll need to go through the National Archives, at http://www.archives.gov/veterans/military-service-records/.
Hello there! As your question is related to looking for identification/information regarding military personnel, our Guide on Military Identification may be of use to you. It provides a number of different resources, including how to request service records from a number of national agencies around the world, as well as graphical aids to assist in deciphering rank, unit, and other forms of badges or insignia. While the users here may still be able to lend you more assistance, hopefully this will provide a good place to start!