You MUST fill all 12 slots, 1 lvl 120 BO, and 11 other random 115+ guys :)

You don´t need a pair of gunners, you could use any support 115 or avobe. I.E, some people uses repair, restorer, seaman in R slots, and a sonarman or engine in the 9th support slot (since engys and sonarmans doesn´t work on ship slots!!)

Best setup imho is 2 gunners 115 with HHs, 8 pilots and an engineer

I don't know about the US medic.

France is the only nation where any medic (US or German) would work, so you're fine there - provided the medic is at least at level 115.

Getting a good crew for the CV6 is a super long grind.

A solid CV6 crew includes gunners and both Fighter and Bomber pilots.  You'll want at least 6, 7 or 8 Fighter pilots for those heavy air superiority missions and HA. You'll need bombers and at least 3 or 4 should be available, more if you want to go BW crazy.

Filling pilot slots with support guys might get your ship in the water, but it's not up to the CV6 potential with the plane capacity it provides. The 14 lifts and 100+ plane load gives the CV6 a lot of options in getting planes into the air and active.  Your team deserves a fully staffed CV6 be operational, not a 5 or 6 pilot ship that isn't actively loading planes for battle all the time.  Use a PCV or CV5 until you get your crew established, they're very good CVs too and will net decent XP up to your  desired crew levels.

You need gunners too.  If you have no defenses when a sub shows up, or even some pesky DD...you can be sunk rather quickly.  

On my cv6 I run a AA escort with sonar, for one your to buzzy to use AA, for two even though the AI is not so good, it scares ftrs away, three its a free slot to put your sonar on.
But on the cv its self, i like to run 8 pilots and a seaman up top, one repairman in front R slot, and a gunner in the rear R slot with PHH, cause the rear gun has more space, and is enough to kill subs with PHH, and the repair is nice to have incase u get DB, you will repair b4 the next wave. 

Obviously everyone has a different setup that works for them on their cv6. I got lucky and came across a 5th lvl 120 fp and a 120 engy that completed my cv6. Im leveling up gunners at 108 right now to fill the R slots eventually. I have found my favorite setup is 5 fp, 2db, hero seaman, and the engy. When I want to BW I drop the 5th fp and engy and run a 4fp, 4 db hero seaman. Both are great setups for me and cant wait to get the gunners lvled. 

Jes it will

In HA in oru fleet we only drive CV with HH and sona to find the SS


In GB I only drifew 8 fighters and 2-3 Seameen when i have 2 seaneen i use a gunner too 

I remember that medics works on ships of all friendly nations.

eg  german medics works on all axis ships, an american medic works on all allied ships.

That was the gamemechanic on NFEU, i dont know how it work here, on NFNA.

but why you should use medics? there are so many events: expert and vet conv. boost, EP boxes with hundreds experts etc. So you can fill up your crew looses.

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seaman are another question.

as long as your crew have not reached the cap they are usefull. After that, they are worthless, exept in WoW rooms. time, slots, boosts etc to level up a seaman are wasted.

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sometimes you must launch aircrafts as quick as possible (eg 5x2), sometime bigger formations (4,4,4). for a maximum of flexibility is a minimum of 7 pilots required.

my thoughts, my mind ...