Frederick Municipal Airport (FDK, elevation 303 feet) with a long-standing glider club on the field, recently began tower operations. After the tower had been operating for about one week, on a relatively busy Saturday afternoon I heard this exchange:
"Frederick Tower, Glider XXX at 1,600 feet inbound for a right downwind for landing runway 12, with information Sierra ... ."
"Glider XXX, Frederick Tower. Hold your altitude. I have a few ahead of you."