September 15, 2011 08:15 AM

After enjoying a summer fling, diving into a bar’s pool in Croatia and proving himself a major mover and shaker in London’s financial district, what’s left for Prince Harry on his birthday Thursday?

The 27-year-old is spending the day at RAF Wattisham airfield, where he’s in the final throes of his training for Apache helicopters.

Then again, it’s already been a week of hyper activity. Monday he attended charity day at the BGC financial firm in London – and took the phone call that broke the world record for the biggest currency trade ever, nearly $29 billion.

“He seemed quite a natural,” says a royal source. “If he didn’t work as an Apache pilot, he’d have a good second career.”

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The fundraising day – on behalf of 29 good causes, including Harry’s Sentebale charity – is held in memory of the staff from BGC’s sister company, Cantor Fitzgerald, whose office was lost in the World Trade Center attacks of Sept. 11, 2001.

Next up for Harry: a two-to-three month training tour in the U.S., where he’ll visit bases in California and Arizona to fine-tune his combat skills.

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