Harry burgeoning military career taking up most of his time these days, 27-year-old Prince Harry appears to be entering a new phase of maturity. But that doesn't mean to say that he's put his wild ways fully behind him.Currently in the US completing phases of his military helicopter training in El Centro, California, near the Mexican border, Harry has been taking full advantage of the more ‘civilian' life he can enjoy in the US, which has so far included hiring a Harley-Davidson bike to tour the California coast, hitting the blackjack tables in Las Vegas during a boys' weekend, and enjoying Sin City's nightlife at celebrity haunts, XS and Tryst nightclubs at the Wynn hotel.But despite being kept busy on his two-month-long training programme, sources say that Harry has also been taking time to dish out some relationship advice for his sister-in-law, Pippa Middleton, who recently split from her man of 18 months, Alex Loudon.