artillery regiment badges?

[on.off]

i believe these 2 are artillery regiment badges, c. wwii
does anybody know specifically which regiments they are from?
thanks!

 

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[nhbenz]

Left is what was the 246th Coast Artillery, which later switched to 246th field artillery.

 

[nhbenz]

On the right is the 265th Coast Artillery.
Both are here: http://cdsg.org/wp-content/uploads/pdfs/FORTS/CACunits/CACinsignia.pdf