Weaponized Math, by Jonathan Brazee

Weaponized Math is in The Expanding Universe Anthology, vol. 3.  I think it's a Sad Puppy entry for the Nebulas.  It's pretty much a war story, with minor tweaks to transport it slightly into the future and to another planet.  I think it could be set in a dry area of South America pretty easily.  The protagonist is a female sniper, who has killed gunmen from long range and thus earned the title Hunter of Gunmen.  The story describes the battle and weapons in detail satisfying for a military fiction fan.  The guy has been there and knows how battle goes.  But it's really not particularly speculative.  2 stars.