Related Clues:
- Grp. joined by Montenegro in 2017
- Military alliance in collision at once
- Transoceanic alliance since 1949
- Gp. joined by Montenegro in 2017
- Brussels-based defense grp
- Alliance with its HQ in Brussels
- What Croatia joined in 2009
- Org. founded in 1949
- Treaty org. founded in 1949
- Peacekeeping group founded in 1949
- Peacekeeping group
- Grp. that Montenegro joined in June 2017
- '49 peacekeeping alliance
- Intl. alliance with a phonetic alphabet
- Brussels-based mil. alliance