By Air Land and Sea Mystery Cache
wy0v: Missing for the second time.
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Difficulty:
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Terrain:
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Size: 
(regular)
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This should be an easy one to find. You are looking for an ammo box with a combination lock. The combination is the same as the alpha - numeric designation of the Air National Guard wing located at the Sioux City airport (or see the HINT).
Take a break from geocaching to visit the nearby museum and discover the Amazing World of Aviation and Transportation. Take a step back into history and encounter unique artifacts and exhibits that help tell the exciting story of aviation and transportation in our lives. Explore a wide variety of displays and exhibits of full size aircraft and surface transportation from bicycles to vintage automobiles, a fire engine, and even a Boeing 727-200! The Mid America Museum of Aviation and Transportation preserves and celebrates the rich aviation and transportation history of the Sioux City area.
Additional Hints
(Decrypt)
185gu