Kinda like this one...perhaps?

2-321st AFAR

 

I think that is the Battalion crest for 2nd Battalion 321st Field Artillery Regiment which is part of the 18th Fires Brigade (Airborne).  Which I believe has the crest below:

 

 

It said it was the crest for the 321st Field Artillery Reg which was a subordinate unit of 4th Brigade Combat Team, 82nd Airborne Division.

 

I take it the 321st you seek is another 321st?

 

 

I think you are correct DB, that may be the Regimental Crest.  I have only worked with the 3 Battalion however and they wear that crest with "Noli me Tangere" on it as the Badge on there Beret, I thought that was their Battalion Crest.  And they wear the Winged Cannon (Or Flying Dildo) on a sleeve.  But I have seen another patch which has some sort of Dragon on it which I thought was the regimental crest.  Basically Im all confused!!!!!