Unstoppable by Jonathan Maberry

Joe Ledger Fans Rejoice!
Everyone's favorite snarky, dangerous, idealistic, relentless covert operative is back, and this time he's brought friends. Joe Ledger: Unstoppable presents original short stories about Joe Ledger and the Department of Military Sciences by some of New York Times bestseller Jonathan Maberry's "friends in the industry." Buckle up for powerful, exciting, and nail-biting adventures by Seanan McGuire, Scott Sigler, Larry Correia, Weston Ochse, Steve Alten, David Farland, Aaron Rosenberg, James A. Moore, James Ray Tuck, Javier Grillo Marxuach, Jennifer Campbell-Hicks, Jeremy Robinson, Joe McKinney, Jon McGoran, Keith R.A. DeCandido, Nicholas Seven, Bryan Thomas Schmidt, P.G. Charles, and Dana Fredsti!
Joe Ledger is a former Baltimore cop who was recruited into a secret government agency tasked with stopping terrorists who are using bleeding-edge science weapons. The stakes are always high. If you have to call Joe Ledger, it's already hit the fan!