Having a chart will help immensely considering that camo fabrics run the range from tissue thin to you can make a tent and sleep under it.
Needles need to have 2 pieces of information from you based on fabric: size, type
The way I buy this fabric I normally get oz, so I tend to base the needle size on that fabric weight. Saying that, most of what I sew is medium weight (sateen, satin, nylon, light twill) of 5-12 OZ and I use a 12, 14 or 16 needle. This is dependent on WHAT I am sewing...satin and lighter nylons tend to use a 12, and 16 is for the heaviest of the fabrics. 12 and 14 do most of what I need, since most of the fabrics I use are between 6-9 oz (twill, stiffer bridal satins).
Anything over 12 oz (which is about a medium weight jean) is usually a 16 or 18 needle. Again, this is dependent on the actual fabric...I have some I use a 26, but I am aware of the brand and type of fabric that uses this and it is really freaking rare in the camo end (it is one ready to wear manufacturer, and only needed for zipper replacement in 3 items: jacket, overalls and one style of jean...the rest can use a 21.)
As to type...universal, ball point, sharp, jean and microtex are the most common and they each have their own uses.
Universal is a basic every day sad, beige mommy type. Works on most everything.
Ball Point is for jersey and knits.
Jean is for denim and thicker materials (basically anything that is as heavy as a pair of jeans)
Microtex is a weird needle. Silks, some microfibers and coated fabrics MAY need this type of needle. It is a sharp needle, with a small tip and scarf and leaves smaller holes. It also needs to be changed more often.
Size is the first thing, then type. It is hard to say on this fabric because there is a lot of factors to take in (and I can't see the actual fabric you're asking about). Thread size also plays a role; the thicker the thread the bigger the needle.
Having a basic chart on size and type will help you out more then us here can and on something I would use a size 18 jean, someone else would use a size 16 sharp.