The piece of music the little girl plays on the piano in the Officer's Club is Mozart's "Piano Sonata No. 16 in C Major"
This episode is the second in which Frank has been awarded a Purple Heart, both times under dubious (arguably fraudulent) circumstances. The first was in season one's "Sometimes Your Hear the Bullet" when he threw out his back while dancing with Margaret in her tent.
Frank is the only one not in the group saying goodbye to the kids when leaving.