Related Clues:

• Not necessary
• Not mandatory
• Voluntary
• Yours if you want it
• Not required
• Like some new car features
• Not included
• Not standard
• Unrequired
• By choice, elective
• Not compulsory, discretionary
• Take it or leave it
• Elective, as you choose
• Not compulsory
• Platoon I join as a matter of choice