sentences:  Higher-performance Block 25 F-16C/D aircraft replaced the standard fighter-bomber Block 15 A/B model aircraft in 1996.Although similar in appearance to the earlier models, the Block 25 aircraft were a considerable advancement with the Westinghouse AN/APG-68(V) multi-mode radar with better range, sharper resolution, and expanded operating modes.The planar array in the nose provides numerous air-to-air modes, including range-while-search, uplook and velocity search, single target track, raid cluster resolution, and track-while-scan for up to 10 targets.