Major Dad (1989)

Major John MacGillis is a conservative, by-the-book, die-hard Marine. Polly Cooper is a pacifistic, liberal journalist. Nonetheless, when the two meet, there's instant and intense chemistry between them. With the permission of Polly's three daughters, the two get married within weeks. Now Polly and her girls must learn how to deal with being a Marine family, while Major MacGillis must learn how to be a Dad.