The answers to the clues below will have something in common.

1. Army-issue uniform color
2. Mugger defense
3. Atomic Age symbol
4. Radio hobbyist
5. Kremlin feature
6. Utah desert expanse
7. Redhead - familiarly
8. Bookish sort
9. Metaphor of potential
10. Get bigger and stronger
11. Emergency sources of food
12. Unstable Central American country, perhaps

Answers:

1. Olive drab
2. Pepper spray
3. Mushroom cloud
4. Ham operator
5. Onion dome
6. Salt Flats
7. Carrot top
8. Egghead
9. Mustard seed
10. Beef up 
11. Food/Soup lines
12. Banana Republic