The "Navy Hymn" is Eternal Father, Strong to Save. The original words were written as a poem in 1860 by William Whiting of Winchester, England, for a student who was about to sail for the United States. The melody, published in 1861, was composed by fellow Englishman, Rev. John Bacchus Dykes, an Episcopalian clergyman.

The hymn, found in most hymnals, is known as the "Navy hymn." This version is being sung by the U.S. Navy Band's Sea Chanters.  It is sung on ships and ports of the U.S. Navy, and on United States Marine Corps installations.   It is also sung on ships of the Royal Navy (U.K.), and on installations of the Royal Marines (U.K.).  It has been translated into French, and other languages.

What does “oorah” mean?  Wlhile the expression wasn’t used while I was in the Corps, it began to be used in the 1980’s by Marines.  I’ve asked a lot of retired Marines what they know, and it’s background remains a mystery.  But, I may have a clue.  A movement begain in Israel in 1980 named “Oorah.”  The Hebrew word means “Awaken.”  That seems to fit the Corps.  The Jewish organization named “Oorah” was founded with the goal of awakening Jewish children and their families to their heritage.  Families who are interested in enriching their spiritual lives are provide the right resources to succeed.  Oorah enables Jewish children to enroll in Jewish day schools or yeshivos, where they receive a full religious and secular education straight through high school.  Adults are provided adult education opportunities,  as well as all the ritual objects and support they need to live a full Jewish life.

Does anyone have a better explanation?