Sometimes you hear an exploit and wonder why it has not been made into a feel good movie. Sgt Reckless is one such story. The horse served with the US marines in Korea and made 51 trips up a mountain in the height of a battle (Operation Vegas), resupplying the Marines with ammunition. The horse saved countless lives and was decorated. She retired to Camp Pendleton where there is a memorial to her.
You can read more about Sgt Reckless here.
And there is short video about her:
I do hope that they will do a movie about the horse. It does sound like the sort of tug at your heart movie for all the family.