How does an underscore in front of a variable in a cocoa objective-c class work?

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If you use the underscore prefix for your ivars (which is nothing more than a common convention, but a useful one), then you need to do 1 extra thing so the auto-generated accessor (for the property) knows which ivar to use. Specifically, in your implementation file, your synthesize should look like this:

@synthesize missionName = _missionName;

More generically, this is:

@synthesize propertyName = _ivarName;

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