In the North Atlantic Treaty Organization (NATO) phonetic alphabet, which word represents the letter S?

Maman Moustique, You may want to re-read the information above.

sorry, what is the relationship between the abbr 'NATO' and radiotelephony spelling sys?

For those who might not know: A=Alpha B=Bravo C=Charlie D=Delta E=Echo F=Foxtrot G=Golf H=Hotel I=India J=Juliett K=Kilo L=Lima M=Mike N=November O=Oscar P=Papa Q=Quebec R=Romeo S=Sierra T=Tango U=Uniform V=Victor W=Whiskey X=X-ray Y=Yankee Z=Zulu

Kris, was a long time ago for me as well sir!