APG-66(V)3 - as APG-66(V)2 but with CW illumination capability, possibly for export to Taiwan. Also employed in select US Navy P-3 Orion aircraft as part of a Counter Drug Update (CDU) for Counternarcotics (CN) surveillance and interdictioon operations in support of USCG[1]
APG-66(V)X - improved version of the APG-66(V)2/3 radar with greater detection range.