<Tr> <Th_colspan="2"> Military History of the United States </Th> </Tr> <Tr> <Th> Founded </Th> <Td> Continental Army--June 14, 1775 (1775 - 06 - 14) </Td> </Tr> <Tr> <Th> Service branches </Th> <Td> United States Army United States Marine Corps United States Navy United States Air Force United States Coast Guard </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> The Pentagon, Arlington County, Virginia, U.S. </Td> </Tr>

Which happened first korean war or vietnam war