Jack thought he was coming back this Sunday from a six-month deployment in Qatar.
Sgt. Francesco burst in with balloons and big hugs and plenty of cheers from Jack's classmates.
But best of all was his son's face.
"The reaction was priceless and, you know, that's all I can hope for," said Sgt. Francesco.
This wasn't the only surprise Sgt. Francesco had planned. He stopped in to see his 7-year-old son, Nicolas, at school too.
* More New Jersey news
* Send us a news tip
* Download the abc7NY app for breaking news alerts