The following creed comes from Tom Miller, a chaplain in the US Army. It is easy to apply to our lives as soldiers in a spiritual army. Replace "American" or "United States" with Christian or Christ Follower and you'll see what I mean. I especially was convicted about never leaving a fallen comrade...
Soldier’s Creed
I am an American Soldier.
I am a Warrior and member of a team. I serve the people of the United States and live the Army Values.
I will always place the mission first.
I will never accept defeat.
I will never quit.
I will never leave a fallen comrade.
I am disciplined,. physically and mentally tough, trained and proficient in my warrior tasks and drills. I always maintain my arms, my equipment and myself.
I am an expert and I am a professional.
I stand ready to deploy, engage, and destroy the enemies of the United States of America in close combat.
I am guardian of freedom and the American way of life.
I am an American Soldier.