警備員 is used a lot. But WWWJDIC only has one 警備人 example, and seven 警備員 examples. So I'd be inclined to leave it as it is (or add the 警備員 version as an alternative).
# --------------------------------------------------------------------------------
# This comment was copied from #102876 when duplicate sentences were merged.
# --------------------------------------------------------------------------------
けいびにん, and if it doesn't now it will do in a few hours time.
# --------------------------------------------------------------------------------
# This comment was copied from #102876 when duplicate sentences were merged.
# --------------------------------------------------------------------------------
警備人 should probably be changed to 警備員; it's not regarded as the proper term.
# --------------------------------------------------------------------------------
# This comment was copied from #102876 when duplicate sentences were merged.
# --------------------------------------------------------------------------------
Thanks. I see it's now the same as #522337 so they'll probably get merged.
# --------------------------------------------------------------------------------
# This comment was copied from #102876 when duplicate sentences were merged.
# --------------------------------------------------------------------------------
Duplicates of this sentence have been deleted:
x #102876