In the 1956 Oscar-winning short film “The Red Balloon,” it was the balloon that did all the chasing of a little French boy. This weekend, you can turn the tables on the helium-filled children’s playthings as part of the Defense Advanced Research Projects Agency and its Network Challenge — a race to be the first to find the locations of 10 red balloons somewhere in the continental U.S. However, unlike the cable-friendly antics of a certain notorious Colorado family, this balloon chase is on the up-and-up.