what colors should i mix to get dark sea blue used on US navy planes of ww2?

There is no need to mix the colour - all of these are DSB:-

Gunze Hobby Color H54
Gunze Mr Color C14
Model Master Acrylic 4686
Model Master Enamel 1717
Vallejo Model Color 898/48
Vallejo Model Air 71087
Life Color UA44
Agama A04M
Xtra Color X121
Humbrol H181
Pactra A49
Revell 32350
Tamiya XF-17
Polly S 505092

Theses colors aren available to me they don sell model stuff here i get it from abroad. i have basic colors in humbrol enamel so any idea wat i would need to mix?

Add drops of black to navy blue until it looks good. Remember that even though it was tough and glossy, the paint would still fade due to the effects of salt spray and sunlight. Unless you're intending to show a factory-fresh aircraft, the colour would never be an exact match for the specification. Err on the light side and then tell the colour police that it's faded. Dare them to prove you wrong

Thanks alot