penetration aid: Meaning and Definition of

penetra'tion aid"

Pronunciation: [key]
— Mil. Mil.
  1. a device or tactic, as the use of chaff or decoys or the maintaining of a low flight level, that helps an aircraft or missile to enter hostile air space.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.