Don't worry about the 'Murrica. I'm sure he's from one of those 'Urop startups we're hearing so much about....
:^)
On topic I'm pretty sure NASA uses metric units, after they had that one launch in the 90's that messed up do to a conversion error between metric and imperial.
NASA used metric units before and after, and they were right there in the spec. The problem was their contractors at Lockheed using some other units instead.
:^)
On topic I'm pretty sure NASA uses metric units, after they had that one launch in the 90's that messed up do to a conversion error between metric and imperial.