If you’ve noticed a few extra helicopters buzzing above D.C. in recent days, it’s not because of any stepped-up police or military presence, though some of those choppers are flying pretty low to the ground.

Posted to the Metropolitan Police Department’s email lists this morning: an exciting volunteer opportunity!4 DC hospitals in Washington (Washington Hospital, Children’s, National Rehab and Veterans Affairs) are conducting an exercise involving a dirty bomb scenario and we will need about 100 victim volunteers. Please feel free to announce this volunteer opportunity through your network and ask that those interested in volunteering contact me prior to March 26. The volunteer duty would be on Friday, April…