What system can be interfaced with the M777A2 for fire mission planning?

The Fire Control Computers (FCC) are integral to the operation of the M777A2 Howitzer. They are designed specifically for artillery fire control and allow for efficient fire mission planning. The FCC processes data such as target location, environmental conditions, and weapon system capabilities to compute the necessary firing solutions. This capability enhances accuracy and effectiveness during fire missions.

The other options, while relevant in the overall context of military operations, do not directly interface with the M777A2 for fire mission planning. Strategic Command Systems help in command and control but do not focus specifically on artillery fire solutions. The Target Acquisition System assists in identifying and locating targets but does not directly engage in the planning of fire missions. The Global Positioning System (GPS) provides critical location data and enhances targeting capabilities, but it does not perform the functions of fire mission planning like the Fire Control Computers do. Thus, the FCC is the system that plays a central role in interfacing for fire mission planning with the M777A2.