Adds Blueshield Beret to Ian clothing

Allows Ian to wear the Officer's Beret and the Navy Blue Officer's Beret in order to become Blueshield Ian, protector of Command and biter of ankles.

code/modules/mob/living/simple_animal/friendly/corgi.dm

@@ -373,6 +373,12 @@
 				name = "Definitely Not [real_name]"
 				desc = "That's Definitely Not [real_name]"
 				valid = 1
+			
+			if(/obj/item/clothing/head/beret/centcom/officer/navy)
+				name = "Blueshield [real_name]"
+				desc = "Will stand by you until the bitter end."
+				emote_see = list("stands with pride.", "growls heroically.")
+				valid = 1
 
 	if(valid)
 		if(user && !user.drop_item())