Prince Harry turns 27 Thursday, but the Royal ginger won't be partying it up too hard. Instead, he'll be working.

According to E! Online, Harry will be spending the day at the Royal Air Force's Wattisham airfield in rural Suffolk, England, where he's completing his training as an Apache helicopter pilot.

Still finding time for fun, Harry was caught on video dancing -- and looking quite inebriated -- at a night club before jumping in a pool, fully clothed, while on vacation in Croatia in August. The video was captured by a fellow clubgoer at an exclusive open-air club called Veneranda.

Harry will be visiting California in early October, according to an Associated Press report, as part of his training course. The prince will train at the Naval Air Facility in El Centro, Calif., as well as a base in Arizona. Still, the young royal and his fellow pilots will catch a break and spend 48 hours in Lav Vegas midway during the training.

A military source told The Daily Mirror that the mini-break is a traditional breather for Apache trainees.

The course doesn't have much downtime, the source said. It's pretty intense. This is a chance for pilots to let their hair down, kick back and enjoy themselves.