Oh, right, Covert is getting buffed, not fixed, after the entire ground pvp community has been pointing out that it is horribly broken for almost a year, and Lunge is getting buffed after we've been asking for it to be fixed since the melee update broke it.
Science officer's are interpreted to primarily focus upon one of three possible career paths:
Researcher (group buffs and debuffs)
Scientist (single person buffs and debuffs)
Doctor (player heals)
While skills for all three careers are mixed and matched by the choice of the player, the trait name, Medical Vanguard, implies something for the Doctor to do. Medical specific skills don't buff shields.
I respectfully suggest renaming of this trait to Researcher's Vanguard.