I am the first to complain about imperial units but this article is mostly metric. As long as metric/SI is there, I have no problem with what they chose to show next to it, including swimming pools, football fields and Hiroshima bombs.
Also feet happen to be the standard measurement of altitude in aviation, which rockets are part of, even in metric countries, I hate it but it's like that. Distances are nautical miles, a not so bad unit (it corresponds to 1 arcminute on earth), which make me hate the use of terrestrial miles in articles partaking to aviation even more. But it is a bit offtopic here because most of the article is metric.
Also feet happen to be the standard measurement of altitude in aviation, which rockets are part of, even in metric countries, I hate it but it's like that. Distances are nautical miles, a not so bad unit (it corresponds to 1 arcminute on earth), which make me hate the use of terrestrial miles in articles partaking to aviation even more. But it is a bit offtopic here because most of the article is metric.