According to MILSPEC FM003-15.3/(provisional)/Email/Subject Lines/, which however is so highly classified you are not allowed to have a look at it.
in reply to Email subject lines should be written:
Please send a properly formatted email message to apply for clearance.
A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
My blog: Imperial Deltronics