The military effectiveness of Black Buck remains controversial, with some independent sources describing it as "minimal". The runway continued to be used by Argentine C-130 Hercules transport aircraft until the end of the war, although after 1 May only of supplies and 340 troops were delivered, and early flights were suspended after 4 May, as Black Buck missions occurred in the early morning hours. Woodward has stated that he "fully expected" Hercules flights to continue after Black Buck One, but that he "did not care too much about that" at the time since, unlike fast jets, they were not a direct threat to the naval forces. The British were aware that Hercules flights continued to use the airfield and attempted to interdict these flights, leading to the downing of a C-130 on 1 June.