Hi I was wondering if people had suggestions what a good starting base color would be for US army uniforms world war 2 and US marine uniforms using Jo Sonja paint?

A bit hard to answer simply, as there are literally hundreds of US Army and USMC uniforms to choose from. Can you be more specific? In particular, note the year of the uniform or at least the year of the war, the theatre of operations and the specific figure. It will then be easier to help you with a paint colour recommendation from the Jo Sonja range.

Sorry about that I was interested in the 1944-1945 years for both branches.

OK, could you narrow it down further? Specific uniform - USMC duck hunter camo, US Army paratrooper, US Armoured...….
The list of uniform variants is huge, so how about you show a photo of the figure you're working on.
That should make it easier to provide some advice on colours.

OK I have bought a couple of Alpine set that I am looking to paint the first one is the 35204 WW2 US Infantry Set. Then the other sets are the 35171 US army infantry set and the 35252 US paratrooper set.

It's always helpful to add a picture or two, rather than just production set numbers.

35204 35171 35252

Cheers,
Andrew

I have not used Jo Sonja paints so cannot give a comment, but I assume you'll have to mix your own to achieve a required colour.
However, when painting Americans in WW2 I have regularly used the two Lifecolor sets:-



They are easy to use, dry completely matt, and intermixing yields a large range of hues.

Cheers,
Andrew

Thanks I have looked at this brand. I have used vallejo but I hate how the paint separates out and the bottle clogs easily. Quick question does Lifecolors paint stay in solution better than Vallejo or does it separate also.

I have the Lifecolor sets Andrew posted and they are excellent. The colors are spot on, dry matte, and the paint is very easy to work with on the wet palette. I have also mixed the Lifecolour paints in these sets with Vallejo for shading and highlighting with no problems.

Scott

Unlike Vallejo and other paints in dropper bottles, which can have a clogging issue, The Lifecolor paints come in wide necked bottles.
This is set 1 in its box:



and ready for use after a good shake:



I've had both sets for years, and they're still as good as when I got them.

Cheer,
Andrew

If I where to try Jo Sonja would moss green be a good choice?

You really need to check the various colours that were used by the US Army against your Jo Sonja colours / mixes.
A good reference to begin might be:-
https://en.m.wikipedia.org/wiki/United_States_Army_uniforms_in_World_War_II
Just take the colours (e.g. olive drab shade 33) and feed into Google to give you an idea of the colour required.
For a quick reference, the following site has a number of uniforms and equipment used by various armies in WW2:
https://historydaily.org/world-war-2-military-uniforms
Happy researching.

Cheers,
Andrew