you've been trained to hide behind cover and help allies to move to more beneficial positions. you gain the following reactions
*repositioning- when an ally makes a ranged attack roll, as a reaction you can move up to half of your speed to a space that provides cover
*covering fire- when a ally uses their movement, you can force a number of creatures you can see up to your proficiency bonus disadvantage on ranged attacks made on that ally if they fail a dexterity saving throw the dc= 8+ your dex modifier+ your proficiency( if your proficient in the ranged weapon your wielding ) until the end of your next turn
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