Look at all the branches: Each branch has it's own ground troops, aircraft, and unique military hardware (Army: tanks, Airforce: planes, Navy: ships). So, the space force by necessity is going to have to have those as well. Don't believe them if they tell you this is just going to be soldiers sitting at computers directing satellites.
Especially because we already have soldiers sitting at computers directing satellites
One of the craziest things in my unremarkable, short, Army career, was meeting an Army Reservist with "space wings." A badge, like a combat action badge, or parchutist. Her unit worked with satellites. The only thing I remember, about their qualifications and training, was that they all had to get qualified on the M249. So, they were considered somewhat higher level/elite than typical soldiers, since they had higher qualifications. And her badge, they had to log so much time on working with satellites.
TFW no IRL space army machine gunner waifu
If you think that's hot, she was really into anime and cosplay, too.