Far as I can tell, meant to have a full run from Alpha to Zulu. Right now, there are about three we actively have involved with us. Others have recent retired. Or died. The fourth was killed a few days ago. Check the network for her untimely demise. [charming isn't it]

[she doesn't like it, and she dislikes discussing it less, especially when there's so little she knows on the matter. the Callsigns shouldn't be so disposable, not for what they are.]