I was wondering about the whole first aid thing...
We run a boarding action against a tyranid captured vessel with hormagaunts an genstealers as opponents. Hormagaunts: reduced to pieces in seconds, genestealer...well...guess what...one hit, (3 degrees of success, razor sharp doubles the penetration) 25 points of wounds. No apothecary in the kill team,bad luck, brother...
And now the same story with an apothecary...ok, First aid (Intelligence bonus 4-5 points of wounds restored), additional 1d5 wounds with the apothecary trait, doubled by narthecium..."stand strong brother, may the emporer be with you...and better luck with your next genstealer"...with a lucky roll 20 points restored.
What troubles me is that there is nothing in between...either you have the highest medical attention possible or you have none.
I mean every soldier in the world is trained on basic first aid (ok, they are not as though as marines) and space marines are the elite of the elite and they are valuable...a loss of a battle brother takes a great ammount of time and resources to compensate. In the "standart chapters" apothecary are with every major combat force but kill teams are on their own, without the backup of a larger force and they are sent to even greater dangers than "standart" marines.
In my opinion medicae should at least availiable as a untrained skill for Deathwatch Marines.