Medic really. Accurate guns and you can heal yourself. Wich keeps you alive more.
Dont look to much btw to K/D. Play your role. Drop ammo, heal, revive people etc. More important then pure K/D.
If you are playing conquest, its more about the objectives than your ratio.
In Conquest your score per minute is much more important than your K/D ratio.
Just be sure to resupply your teammates and play the objective. And have fun!
Thanks for the responses, I may dabble a little with the medic, but I will continue resupplying my team with ammo. I'm definitely enjoying the game, just need to get better, unfortunately my gaming peak was about 20 years ago lol. Once again thanks for the responses.