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Yip Yip Yaphank

At the grand finale... Sergeant Berlin led the entire 300-person cast off the stage, marching them down the theater's aisles, singing 'We're on Our Way to France,' all to tumultuous applause. The cast carried off their little producer like he was victor ludorum... Tin Pan Alley had joined hands with real life

— biographer Ian Whitcomb.

In 1917, Berlin was drafted into the United States Army, and his induction became headline news, with one paper headline reading, "Army Takes Berlin!" But the Army wanted Berlin, now aged 30, to do what he knew best: write songs. While stationed with the 152nd Depot Brigade at Camp Upton, he then composed an all-soldier musical revue titled Yip Yip Yaphank, written as a patriotic tribute to the United States Army. The show was taken to Broadway where it also included a number of hits, including " Mandy " and " Oh! How I Hate to Get Up in the Morning ", which Berlin performed himself.

The shows earned $150,000 for a camp service center. One song he wrote for the show but decided not to use, he would introduce 20 years later: "God Bless America".