I'm reminded of this emblem:
Expired Image Removed
which is noted as "Officer and Chief Warrant Officer Cap Insignia – Two gold colored crossed fouled anchors with burnished silver colored shield surmounted by a burnished silver spread eagle facing to wearer's right (in 1941 the eagle was changed to face to the right; to the wearer's sword arm). It may be embroidered or made of metal (standard or high relief)" at
http://blog.medalsofamerica.com/officer-chief-warrant-officer-cap-insignia/ .
But the service is not noted.
I'm currently guessing some sort of late 19th Century or early 20th Century naval militia, perhaps? Trying to find out if Louisiana had a naval militia... At any rate, I'm pretty sure it's post-Civil War.
ETA: Looks like WWI-era Navy or Coast Guard insignia, but I haven't found an example with the bird (other than the eagle) yet...