The B61 has been deployed by a variety of U.S. military aircraft. Aircraft cleared for its use have included the B-1 Lancer, B-2 Spirit, B-52 Stratofortress; F-101 Voodoo, F-100 D & F Super Sabre, F-104 Starfighter, F/A-18 Hornet, F-111 Aardvark and F-4 Phantom II fighter bombers; A-4 Skyhawk, A-6 Intruder and A-7 Corsair II attack aircraft; the F-15 Eagle, F-15E Strike Eagle and F-16 Falcon; British, German and Italian Panavia Tornado IDS aircraft. USAFE and all NATO dual role aircraft can carry B61s. The Lockheed S-3 Viking was also able to deploy the B61 as a nuclear depth bomb.
I googled B-61 gravity bomb. This is an excerpt from wiki. There are hundreds of these in Europe, 12 in Turkey (NATO ally).
http://www.thetrumpet.com/article/11149.31539.160.0/infographic-american-b61-thermonuclear-weapons-in-europe
This should give you nightmares.