An Initials Join (whatever that is) should NOT be used at a civil airfield because most other pilots will not be familiar with the procedure.
Safety is about many things and, in the visual circuit, it is about seeing and being seen; amongst other things, it relies to a very large degree on understanding what the other aircraft is likely to be doing.
Initials Join, Run-and-Break and other pseudo-mil procedures may have their place - at military airfields - but until they are accepted (and published) procedures in the civil world, they should NOT be used at civil airfields.
Common sense, really ...
JD
