Phil Parshall, missionary, author and mobilizer, said it this way,
Someone must sound the rallying call. Those who desire to see others trained, prepared and released to ministry are known as mobilizers. Mobilizers stir other Christians to active concern for reaching the world. Mobilizers are essential. To understand the role of mobilizers, think of World War II as a parallel. Only 10% of the American population went to the war. Of those, only 1% were actually on the firing lines. However, for them to be successful in their mission, the entire country had to be mobilized!
I found this here.