>1SQ
"Set condition 1SQ means to prepare your battle station to the highest degree of readiness for action."
"The highest degree of preparedness, 1SQ means missiles are ready to fire (sub at a base is 4SQ)."
https://www.quora.com/What-does-set-for-condition-1SQ-from-the-movie-Crimson-Tide-mean?share=1