It almost looks like a missile launch from a sub, where it air boosts out and then ignites its rocket motor to get clear.
ICBM's are notoriously fragile, they usually depend on their fuel tanks to provide rigidity, and you can pretty well push a screwdriver through their skin because they need to be light. I'm assuming that firing its main engine from inside of a silo would damage the missile so they launch it with a conventional booster instead.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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