dome of obedience
n.— «Maybe now you can get one of those new MICH helmets to wear. No more headaches like the kevlar “dome of obedience.” So comfortable, it doubles as a pillow…no shit.» —“SGT Shawn Snyder—Sniper Headshot Stopped By Kevlar” Blackfive Feb. 9, 2006. (source: Double-Tongued Dictionary)