WATCH: Bear Grylls wishes the Royal Navy and Royal Marines Charity a Happy 10th Birthday! Charity ambassador and renowned adventurer Bear Grylls wishes the Royal Navy and Royal Marines Charity a Happy 10th Birthday! Bear is an honorary Lieutenant Commander in the Royal Naval Reserve and a Lieutenant Colonel in the Royal Marines Reserve. We are delighted that Bear has taken the time to wish us a Happy Birthday and thank him for his support over the years. To show your support, click below to give a Tenner For Our Tenth. Thank you.