The 50 Years NATO (Sheet of 20) 33 Cent US Postage Stamps 1999 Scott 3354 was issued to commemorate the 50th anniversary of the North Atlantic Treaty Organization (NATO). The stamps feature the NATO emblem and a globe, symbolizing the organization's mission of safeguarding the freedom and security of its member countries. This stamp issue was significant as it honored the alliance's commitment to collective defense and international cooperation. The design and issuance of these stamps allowed the United States Postal Service to pay tribute to NATO's contributions to peace and security. The 50 Years NATO stamps are prized by collectors for their historical significance and testament to the enduring partnership among NATO member nations.