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.
Most falling off toenail will indeed grow bask after fungal infection or severe injuries. However, this might take a long time. With the toe, an injured nail will grow back in around 6 month to a year period after detached. However, this might be various among people, depending on some factors. The nail grow from the matrix, which lies beneath the nails.