Deductions & credits

As a veteran I bank with USAA and Navy Federal, since I'll be retiring and relocating to South America both my banks told me I can keep the accounts open and keep using my debit and credit cards but I have to change my address to the country I will be relocating so they can send me correspondence. I mean is common sense, the credit card still belongs to a US bank, the only thing that changed is the address being foreign.... Help!

 

I do not wish to bother relatives for this.