11) ii. Apache AH-64C Variant
Late in 1991, Congress approved more funding for a program to upgrade AH-64As to AH-64B+ models. Due to the additional funds, the plan to upgrade to the AH-64C was changed. The C upgrade would include all upgrades made to the Longbow, except mast-mounted radar and newer 700C engine versions. The C classification, on the other hand, was no longer used after 1993. After AH-64As received the updated engine in 1990, the only difference between the C model and the radar-equipped D model was the radar, which could be changed from one aircraft to another. As a result, the decision was made to call both types “AH-64D” in the end.

11) ii. Apache AH-64C Variant
