Aero L-29 Delfín
Reportedly , the L-29 has been used in active combat during several instances , perhaps the most high-profile being the use of Nigerian aircraft during the Nigerian Civil War of the late 1960s and of Egyptian L-29s against Israeli tanks during the brief Yom Kippur War of 1973 . 
<triplet> Yom Kippur War <subj> 1973 <obj> point in time