U.S. Army AH-64D Operator's Manual (2005)
-----------------------------------------

CODE RANGE.

The CODE RANGE indicates
the laser code ranges which are supported by the laser
keywords resident on the DTC.

The helicopter is capable
of supporting the Tri-Service pulse repetition frequency
(PRF) laser codes and USAF, Hellfire and Copperhead
pulse interval modulation (PIM) laser codes.

In order for
the LRFD, [ MT LST] and Hellfire subsystem to use a
PIM laser code the appropriate keyword, for the specific
code range, is required:

1111 - 1788 Tri -Service . . . . . . PRF
2111 - 2888 USAF . . . . . . . . . . . PIM
4111 - 4288 Hellfire-A . . . . . . . PIM
4311 - 4488 Hellfire-B . . . . . . . . PIM
4511 - 4688 Hellfire-C . . . . . . . PIM
4711 - 4888 Hellfire-D . . . . . . . PIM
5111 - 5288 Copperhead-A . . . PIM
5311 - 5488 Copperhead-B . . . PIM
5511 - 5688 Copperhead-C . . . PIM
5711 - 5888 Copperhead-D . . . PIM