#Ukraine major Oleksiy Grebenschikov, who, with captain Igor Kharchenko, flew the first helicopter raid into encircled #Mariupol in spring 2022. I think there were six more, but the first of these "one way" flights was certainly a breakthrough that demonstrated Mariupol can be supplied even in full encirclement, delayed #Russia offensive in Donbas and likely thwarted offensives on Mikolaiv and Odessa.