Coat of arms of the U.S. Archbishop George Joseph Lucas, Archbishop of Omaha.
Blazon
Arms impaled. Dexter: Vert, a fess wavy Argent; overall a cross Sable. Sinister: per fess, Argent and Gules; in chief, upon a cross fleuretty Azure a crescent Or; in base the winged bull of Saint Luke Or, holding an open volume of the first.
Motto
“GRACE AND MERCY”.
Reference:

www.archomaha.org
Own work
SajoR