Polikarpov I-3
... that initial deliveries of the Polikarpov I-3 in 1929 were to units in the Belorussian Military District, where they replaced the Grigorovich I-2?
... that initial deliveries of the <b id="mwE_4"><a href="./Polikarpov_I-3" id="mwE_8" rel="mw:WikiLink" title="Polikarpov I-3">Polikarpov I-3</a></b> in 1929 were to units in the <a class="mw-redirect" href="./Belorussian_Military_District" id="mwFAA" rel="mw:WikiLink" title="Belorussian Military District">Belorussian Military District</a>, where they replaced the <a href="./Grigorovich_I-2" id="mwFAE" rel="mw:WikiLink" title="Grigorovich I-2">Grigorovich I-2</a>?