Unequivocally, "HECK NO!"
A federal credit union derives its moniker from the Federal Credit Union Act of 1934, "to make credit available and promote thrift through a national system of nonprofit, cooperative credit unions." It established the Bureau of Federal Credit Unions to "charter and oversee federal credit unions." The NCUA Board is committed to reducing regulatory burden, which enables federal credit unions to offer a variety of services to meet the financial needs of their members.
By law, a credit union is a member-owned financial cooperative, democratically controlled by its members, and operated for the purpose of promoting thrift, providing credit at competitive rates, and providing other financial services to its members.
It is NOT owned by the Federal Government.
While it is required to comply with federal banking laws, when it comes to matters such as the Right to Keep and Bear Arms, it operates like any other business, in that the business is free to operate within state law to either respect the Constitutional right of it's members to keep and bear arms, or to disrespect the Constitutional prohibition against any infringement.
Until we correct the massively twisted and distorted point of view held by the courts, less-rationally-minded business will be free to adopt the brain-dead, three-times stupid response of creating seriously dangerous "gun-free zones" in their walls, a target of opportunity which few criminals can resist.
Although so-called "gun-free zones" occupy less than 10% of the places visited by the general public, they experience a full two-thirds (66.1%) of all mass shootings, precisely because the public has been disarmed. When businesses disarm their customers, they engaged in the most flagrant violation of their safety, placing them at 17.9 times greater risk than had they adopted the same stance as Walmart and the vast majority of local businesses, who simply say, "We respect the rights of our customers commensurate with all local, state, and federal laws."
If state law says "Open Carry is legal," as it is in 45 of our 50 United States (90%), but a business refuses to allow its customers to OC, that business is NOT respecting the the rights of its customers under the law. Doing so invites criminals to prey upon their weakened customers, and dramatically increases the likelihood of injury or death for both their customers as well as their staff.