Dear John (movie, 2010)

Sergeant John Tyree is home on a 2 week leave from Germany. He meets Savannah after he dives into the ocean to retrieve Savannah's purse that had fallen off the pier. John falls in love with Savannah who is a student on spring break helping build a house for Habitat for Humanity. A romance occurs and Savannah falls deeply in love with John. She promises to write John overseas until he returns.