Related Clues:

• Guns
• Controversial event
• Alamogordo event
• See 49-Down
• Nuclear treaty subject
• Subject of illicit trade
• 'Ciao'
• Quip, part 4
• 'See ya!'
• Calm
• Parting word
• This puzzle's theme
• 60's catchword
• 'Hold your tongue!'
• Weaponry