Here's an excerpt taken from Wikipedia in ref to MAESTRO.
"Maestro is a multi-national debit card service owned by Mastercard that was founded in 1992. Maestro cards are obtained from associate banks and can be linked to the card holder's current account. In the United States, Maestro is a PIN-based debit card network closely related to the Cirrus ATM network, also owned by MasterCard. Like other PIN-debit networks in the U.S., Maestro there relies solely on a standard card and PIN, without a chip; signature-debit transactions in the U.S. are handled through the main MasterCard network or the rival Visa network. RBS's former U.S. subsidiary, Citizens Financial Group, switched to Visa, though like most foreign banks with operations in the United States, it used MasterCard's Cirrus network and the card participated in the MasterCard SecureCode initiative."
