True. The DC was developed to clear heavy foilage and trees instantly in areas about the size of a football field for landing zones in the heavy jungles of Viet Nam.
It was used several times in Afghanistan against deep tunnels and is effective for that because it's blast is so huge it removes all the oxygen in it's blast zone - suffocating anyone not directly killed by the blast.
The DC is not considered as effective on deep targets as the Joint Direct Attack Munition (JDAM) which comes in several configuations and is deployable by either conventional or unmanned (cruise missles) aircraft.
Joint Direct Attack Munition (JDAM) GBU-29, GBU-30, GBU-31, GBU-32
But anyone ruling out the use of nukes on Iraq (in retaliation for WMD) is a blind fool.