<Tr> <Td> 18 February 1952 </Td> <Td> Greece </Td> <Td> First </Td> <Td> Greece withdrew its forces from NATO's military command structure from 1974 to 1980 as a result of Greco - Turkish tensions following the 1974 Turkish invasion of Cyprus . </Td> </Tr> <Tr> <Td> Turkey </Td> <Td> </Td> </Tr> <Tr> <Td> 6 May 1955 </Td> <Td> Germany </Td> <Td> Second </Td> <Td> Commonly known as West Germany when it joined; it later reunited with Saarland in 1957 and with the Berlin territories and East Germany on 3 October 1990 . East Germany was a member of the rival Warsaw Pact 1956--1990 . </Td> </Tr> <Tr> <Td> 30 May 1982 </Td> <Td> Spain </Td> <Td> Third </Td> <Td> </Td> </Tr>

How many nato aligned countries were there in europe