Coat of arms of the U.S. bishop Robert William Muench, Bishop of Baton Rouge.
Blazon: Arms impaled. Dexter: Or, a sceptre in bend between two Indian arrowheads Gules, on a chief embattled Azure, three fleurs-de-lis of the first. Sinister: party per pairle: to chief Azure and to base Gules, overall a pall Argent, charged with a simple crozier, the crook to dexter, Sable; in chief within a crescent of the third a fleur-de-lis Or; to dexter an open volume, of the third, charged with an "Alpha" and an "Omega" of the fourth and in sinister a plate charged with a "Chi-Rho" also of the fourth. 
Motto: "Jesus Must Increase".
Reference:

www.diobr.org
Own work
SajoR