"Mr. Browne said a third Bell 412 named "No. 23," after the 23 NYPD officers who died on 9/11, that had been bought in 2002, was reconfigured from a helicopter used primarily for counterterrorism operations to a sea-air rescue copter to compensate for the grounded Bell 412s that were both rescue copters The NYPD currently has five helicopters that are operational."