That’s not true. ASCC did provide pretty much all of the codenames. The US DoD provided the numerical systems. For example:

AA-1 ALKALI

AA-1 was the DoD designation, ALKALI was the ASCC codename.

It should be noted that when you talk about SAMs, the DoD designator denotes the system, the ASCC codename denotes the actual interceptor. So, if you’re talking about a GRUMBLE, you’re actually talking about a 5V55-series missile.

The ASCC is assigned the following and nothing else:

FSU Fighters
FSU Bombers
FSU Cargo/Transports
FSU Helicopters
FSU Miscellaneous

PRC Fighters
PRC Bombers
PRC Cargo/Transports
PRC Helicopters
PRC Miscellaneous

What you are hinting at are the early years before the ASCC was assigned solely the above list. All the rest of the ‘NATO codenames’ are evolved from a number of different committees and working groups. These are not controlled by ASIC (ex ASCC) and there is no cross over. For example it is not ASCC that issued GARGOYLE. Neither does ASCC issue any class designations for ships etc and they also do not designate for radar codenames. There is a clear designation system and ASCC (now ASIC) were assigned the list above and absolutely nothing else. SOC you serve and should know this situation. Although you’ll find nothing on the web officially of this designation system you can get a hint of the various working groups and committees that exist from this website:

http://www.jcs.mil/j6/cceb/multiforahandbook2005.pdf