Often one thinks of service as needing to be a big event, but service is simply giving of one's self for others, even in the small things of life.
The story is told that during World War I there was a senior adult French woman who, throughout one of the summers of the war, stood all day, every day in the blazing heat outside a field hospital with an old faded umbrella, waiting to shield the eyes of the wounded from the heat as they were brought in on stretchers. She seldom said anything, but the very act of helping demonstrated her servant's heart.