A short walk from the main U.S. headquarters facility at Camp Leatherneck, Afghanistan, sits a hulking two-story building behind chain link fences and cement walls. It cost $34 million to build, and it will likely never serve any purpose for U.S. forces. That’s the groan-worthy findings of John Sopko, the special inspector general for Afghanistan reconstruction. The 64,000 square-foot building has been roundly panned in the media today, after it was highlighted in a Washington Post story this morning. SIGAR, as Sopko’s organization is known, sent Defense Secretary Chuck Hagel a letter this week asking about the decision-making process that…