I don't know about nuke school specifically, but generally it's nwus, except on thursdays when it's nsus (last thursday of the month and special days will be either whites or blues depending on the season).
You'll also wear nsus or dress for watch and/or colors. And you can always dress more formally if you want to, it's just that most people will wear nwus when they can because they're generally considered the most comfortable and you don't have to iron and lint roll them everytime you wear them.
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