 The U.S. Army accepted the first PAC-3 MSE interceptors on October 6, 2015, and Initial Operational Capability (IOC) was declared in August 2016.The PAC-3 MSE is capable of intercepting longer-range theater ballistic missiles.In August 2013, Raytheon and Rafael Advanced Defense Systems began to seek funding for a fourth-generation Patriot intercepting system, called the Patriot Advanced Affordable Capability-4 (PAAC-4).