Radiation suit case (Fallout 3)

A radiation suit case is a storage container in Fallout 3 and Fallout: New Vegas.

Fallout 3

 * A radiation suit case can be found in the Franklin Metro utility tunnels. It is underneath the water in the flooded passage before you reach the area with the Burnmaster.

Fallout: New Vegas

 * A radiation suit case can be found at Crescent Canyon east, next to the blue semi-trailer, partially buried in mud. Instead of a metal box looking object it is looks like a footlocker, which might be confusing.
 * A radiation suit case can be found in the Central sewers in the same room as the multiplas rifle.
 * A radiation suit case can be found in the Hidden Supply Cave, but taking it before the quest Wheel of Fortune will force the player to kill Logan to gain entry to the Searchlight police station and Searchlight fire station.

Fallout 3
It will always carry one radiation suit in about one third repair.

Fallout: New Vegas
It may carry a normal radiation suit or an advanced radiation suit. They are usually in full condition.