Having climbed Halfdome in 1989 (via John Muir trail and other trails), I was curious about the story of president Obama and family visiting Yosemite by helicopter. The first very spectacular picture shows the two helicopters (Marine 1 and a Chinook for the press) flying in the foreground of Halfdome, and utterly dwarfed by it. But right above the the scalloped area atop Halfdome there appears to be two white balloons tied together. They might not actually be above Halfdome, but in the foreground, closer to the camera. Hard to say. I'm on a notebook computer, at a coffee shop, with a small screen. Maybe others with bigger screens can see more detail.