The military is a group that tends to keep women away because, in many ways, women face numerous inconveniences and are inherently at a disadvantage.
Even if women join the military, they mostly engage in medical, clerical, and other such roles. Further advancement typically involves operating weapons as tank drivers, pilots, and similar positions.
As for roles that require fighting face-to-face with the enemy on the frontlines, women are extremely rare. However, if a woman can hold her ground in these male-dominated positions, she must be exceptionally outstanding, and incredibly so.
Undoubtedly, snipers are frontline soldiers who need to engage directly with the enemy. Phoenix appearing on the battlefield as a sniper and achieving results already speaks to her capability.
However, for Phoenix to go into enemy territory alone and use an enemy's gun to kill three people she had a grudge against, that's not just about capability.
