When you make a logo for your neighborhood watch be sure to not copy any part of someone’s work:
This is from the US Copyright office:
Q. How much do I have to change in order to claim copyright in someone else’s work?
A. Only the owner of copyright in a work has the right to prepare, or to authorize someone else to create, a new version of that work. Accordingly, you cannot claim copyright to another’s work, no matter how much you change it, unless you have the owner’s consent. See Circular 14, Copyright Registration for Derivative Works.
If you find this top eye on the Internet or magazine you cannot copy it and change it like the bottom eye unless the owner of the this eye gives their consent.
From the Trademarks Website: A trademark is a brand name. A trademark or service mark includes any word, name, symbol, device, or any combination, used or intended to be used to identify and distinguish the goods/services of one seller or provider from those of others, and to indicate the source of the goods/services. Although federal registration of a mark is not mandatory, it has several advantages, including notice to the public of the registrant’s claim of ownership of the mark, legal presumption of ownership nationwide, and exclusive right to use the mark on or in connection with the goods/services listed in the registration.
You would have to be paid for goods or services to get a TRADEMARK. A neighborhood watch cannot have a trademark on their name.