Related Clues:

• Mars is missing hydrogen supplies
• Quintet for most starfish
• They may be presented for visiting dignitaries
• Soldier packing a small collection of weapons?
• Two things you can swing
• Biceps' limbs
• Parts of a computer chair
• Keep at ___ length
• __ Treaty, limiting trade in conventional weapons since 2014
• Mr. Potato Head limbs
• The Hindu god Ganesha is often depicted with four of them
• 18-Across fillers
• Guns (to be borne?)
• Elbows' limbs
• Weapons, as intercepted by Royal Marines