It's also a chance for the president to see how national parks - likened to Europe's cathedrals - need political and fiscal support.
While living in Palm Springs, Calif., with retirement looming, Bill Morse chose to move to Cambodia to help activist Aki Ra rid the country of land mines that kill and maim.
What happens when ordinary people decide to pay it forward? Extraordinary change. See how individuals are making a difference...
Bill Morse stands outside the Landmine Museum in Siem Reap, Cambodia, wearing the Army uniform of the pro-Western Lon Nol government (1970-75).
From the good life to digging up land mines in Cambodia
While living in Palm Springs, Calif., with retirement looming, Bill Morse chose to move to Cambodia to help activist Aki Ra rid the country of land mines that kill and maim.
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