Not to detract from your point, but we used B-52s frequently for air support missions in Iraq and Afghanistan. Units (well, usually AF CCT or TACP on the ground with the unit) could call up fire missions and would get a platform, which could be an A-10, F-16, F-15, F-18, B-1B, B-52, etc. as supplied by the air force based on what was available (usually overhead, or within a short flight). CCT had more flexibility in getting "better" stuff or more specific requests.

So, I'm going to say "2010", but it might actually have been 2011 or 2012 or even 2013 (I haven't kept up).