Army of the Lord

A friend was in front of me coming out of church one day,
and as always the preacher was standing at the door
shaking hands as the congregation departed. He grabbed
my friend by the hand and pulled him aside.
The preacher said to him, “You need to join the Army of the
Lord!”
My friend replied, “I’m already in the Army of the Lord,
Preacher.”
The preacher questioned, “How come I don’t see you
except for Christmas and Easter?”
He whispered back, “I’m in the secret service.”