Sentence:  Any girl willing to follow the simple rules can join the Girl Scouts. As <WSD>Brownies</WSD> they will spend most of their time playing games and singing songs like the <WSD>Brownie</WSD> Smile Song: “I′ve something in my pocket; It belongs across my face, And I keep it very close at hand In a most convenient place.... I′m sure you couldn′t guess it If you guessed a long, long while, So I′ll take it out and put it on—It′s a great big <WSD>Brownie</WSD> smile!” 
Meaning of the word marked with <WSD> tags:  A junior Girl Scout.