You will need tissues for this one....

A Marine got the gift of a lifetime when he returned from Afghanistan to find that his son with cerebral palsy had learned to walk.

The heartwarming moment was recorded as it unfolded in a school gymnasium, as Staff Sgt. Jeremy Cooney believed his son's cerebral palsy would keep him from being able to move without assistance for his entire life.

His wifes says the family "kept the fact that he could walk a secret the whole time his dad was gone."

As the boy's father enters the gymnasium, he looks around for his family until he spots his son.

Sgt. Cooney crouches down and watches his smiling boy walk across the gym floor to his father.