As a life member of AAAAAA, I realy hate undefined acronyms.
Just saying...
...Congestive Heart Failure...
I consulted my Hardy Boys Detective Handbook. On page 37, subsection (f), it is noted that undefined acronyms are acceptable when a message must be transmitted with undue delay in a crisis setting.
(I had a full bladder, so I typed fast, hit send and ran for it)