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Detail of the Peacekeeper missile's "post-boost vehicle."

The post-boost vehicle consists of a liquid-propellant engine, powered by hydrazine and nitrogen tetroxide (presumably fed by the green and tan tanks), and used to provide velocity and attitude correction; a deployment module, which is the structural support for the warheads; and the reentry system, consisting of up to 10 cone-shaped independently-targetable reentry vehicles containing the warheads (MIRVs).

The warheads are covered by a protective shroud (fairing), which protects the reentry vehicles during ascent.