US RQ Designation Overview

Manufacturer	Designation	Name	Note(s)
General Atomics	RQ-1A	Predator	Tier II
Israel Aircraft Industries (IAI)/TRW	RQ-2A	Pioneer
Lockheed Martin/Boeing	RQ-3A	DarkStar	Tier III Minus
Northrop Grumman	RQ-4A	Global Hawk	Tier II Plus

Source

Williams, M., 1997, Air Intel - UAVs Receive Military Designations, Combat Aircraft, January 1998, Volume 1, Number 5, Page 278 and 279.

Ruud Deurenberg, 2 May 2000