Seymore Hersh is saying that US forces are scouting nuclear facilities in eastern Iran. I rather doubt that the report is true, and Seymore Hersh is one of the most untrustworthy journalists out there, but there may be an element of truth here.
Iran’s nuclear program is a major threat. We need to know what they are doing and where. For all the technology we’ve launched into space and all the UAVs and the like we have at our disposal, nothing is as effective as boots on the ground. If Iran decides to start holding the world in a state of nuclear blackmail, we need to have the option of stopping them. If Hersh is correct (which is doubtful), it means that we’re responding to the threat as we should.