The context of the photo is explained at the White House's Flickr photostream:
June 6, 2009
“After his speech in Normandy, a crush of people tried to get close to the President to shake his hand. I noticed this guy waiting patiently and then literally being pushed back into the crowd. I felt bad for him, and mentioned the incident to the President’s trip director, Marvin Nicholson. Marvin pulled the guy out of the crowd, found him a wheel chair, and brought him over to meet the President. He was a French veteran. The man’s face shows his emotion.”
Official White House photo by Pete Souza, via Reddit.