Yes, there are a few non-combat stories, mostly about exploration, but space combat is here to stay.
This is just the natural continuation of the process of militarisation of space Which naturally leads to questions about the space branch of the military of various nations. Some may start out as a subdivision of an existing branch and eventually grow large enough to split off (such as how the US Army Air Corps spit off to become the US Air Force in 1947 ).
There will be "space marines", who generally are found on board combat spacecraft.
They are generally elite fighters, since spacecraft usually can only carry a limited number of them. Frisbee Jr.'s Tips on Writing Military SF and William's Future War Stories.
In our Anglo-American culture, the police handle the affairs of internal compliance while the military organization handles the enforcement of trans—national agreements including protection of property from seizure or destruction by other nations.
The other ships of the line were too distant, traveling on vectors too unlike his own, for their scout boats to come anywhere close.(ed note: This article was written in 1979 and is admittedly a little dated.
Therefore as we go into space we will have to take our highly-evolved cultural heritages and societal organizations with us to forestall disagreements and to resolve conﬂicts.
There are the rules, codes, regulations, laws, and treaties that we have individually and collectively agreed to observe.
Space industrialization will produce new and less expensive space transportation systems.
Space industrialization will produce radically new materials that will have military implications in terms of increased strength, decreased weight, and various other physical properties.