The 3/4 Association is a federally recognized 501(c)(19) veterans organization that supports the Thundering Third and Darkside Marines, sailors, and Gold Star families connected to the 3rd Battalion, 4th Marines. EIN: 76-0408401. Please note that we do not represent or speak for the active-duty battalion. For official information, visit the 3rd Battalion, 4th Marines page, also known as the Thundering Third.