Marines must request paternity leave within 25 days after the birth of the baby. If deployed, the commander can approve paternity leave within 90 days of deployment and can authorize it outside that time period for extraordinary circumstances.
An injury to a nail may result in the loss of the nail. As long as the nail bed itself wasn't damaged, a lost nail should eventually grow back. Healthy fingernails grow at a rate of about 0.10mm per day, but toenails are slower, growing at only about one half to one third of a fingernail's rate.
Well, grow back is a little vague but gum tissue does grow for different reasons. But if by grow back you mean following recession of the gum tissue away from the neck of the tooth the answer is no. In that case it can be restored by a surgical process called grafting. Gum tissue does become enlarged or swollen due to inflammation (gingivitis).