Hmmm ... interesting Question (re chaplain) since I'm a theology student and spend a TON of time figuring stuff like this out lol !!
Chaplains are not primarily preachers, so I personally wouldn't use that sign ... they're carers - they function almost as a Deaconess ...
It's important (at least to me) that the ASL be descriptively accurate
If they are ordained, I'd likely sign it as "hospital+priest" or "PC(personal care) +Priest" - using the Priest sign that shows a clerical collar
If they aren't ordained, I'd probably sign it as a initialized from of "
Deaconess"/Deacon which would be a "C" handshape tracing a cross over the non-dominant shoulder
What do you think