3 - 7 (a) AT MY COMMAND, FIRE. Remains in effect until observer orders CANCEL AT MY COMMAND. (b) CANNOT OBSERVE. Observer cannot see the target. (c) TIME ON TARGET. Observer tells FDC when he wants the rounds to impact. (d) CONTINUOUS ILLUMINATION. If this was not already calculated by the FDC, the observer indicates interval between rounds in seconds. (e) COORDINATED ILLUMINATION. Observer tells FDC to set interval between ILLUM and HE shells. (f) CEASE LOADING. (g) CHECK FIRING. Halt immediately. (h) CONTINUOUS FIRE. Load and fire as fast as possible. (i) REPEAT. Fire another round(s), with or without adjustments. h. Correction of Errors. When FDC has made an error when reading back he fire support data, the observer announces “CORRECTION” and transmits the correct data in its entirety. i. Message to Observer. (1) Battery(ies) to fire for effect. (2) Adjustment of battery. (3) Changes to the initial call for fire. (4) Number of rounds (per tube) to be fired for effect. (5) Target numbers. (6) Additional information: (a) Time of flight. Moving target mission. (b) Probable error in range. 38 meters or greater (normal mission). (c) Angle “T.” 500 mils or greater. j. Authentication. Challenge and reply.