Petrus Jozef Sietse `` Piet '' de Jong ( ; born 3 April 1915 ) is a retired Dutch politician of the defunct Catholic People 's Party ( KVP ) now merged into the Christian Democratic Appeal ( CDA ) .
Petrus Jozef Sietse `` Piet '' de Jong ( born April 3 , 1915 ) is a retired Dutch politician . He is for the Catholic People 's Party ( KVP ) now merged into the Christian Democratic Appeal ( CDA ) .