 The Block 15's APG-66(V)2 model added a more powerful signal processing, higher output power, improved reliability and increased range in cluttered or jamming environments.The Mid-Life Update (MLU) program introduced a new model, APG-66(V)2A, which features higher speed and more memory.The AN/APG-68, an evolution of the APG-66, was introduced with the F-16C/D Block 25.