Yes, there are huge strategic reasons for the space force.
Except of course there aren't.
As pointed out before... prior to Stubby McBonespurs creating space force, the task of handling space-based threats largely fell on the air force (Space Command), something they had no problem doing.
Now, the U.S. is spending billions of dollars (money that could be used to, you know, buy equipment needed by soldiers) to create a new military branch that doesn't even have the infrastructure to function completely independently (i.e. they will still need resources from other military branches), but with whatever overhead comes with having multiple military branches work together.