12 C.F.R. § 740.2
No insured credit union may use any advertising (which includes print, electronic, or broadcast media, displays and signs, stationery, and other promotional material) or make any representation which is inaccurate or deceptive in any particular, or which in any way misrepresents its services, contracts, or financial condition, or which violates the requirements of § 707.8 of this subchapter, if applicable. This provision does not prohibit an insured credit union from using a trade name or a name other than its official charter name in advertising or signage, so long as it uses its official charter name in communications with NCUA and for share certificates or certificates of deposit, signature cards, loan agreements, account statements, checks, drafts and other legal documents.
12 C.F.R. §740.2