strip on the card's right incorporating the hologram. This allowed issuing banks to customize the appearance of the card. Similar changes were implemented with MasterCard cards. Today, cards may be co-branded with various merchants, airlines, etc., and marketed as "reward cards". On older Visa cards, holding the face of the card under an ultraviolet light will reveal the dove picture, dubbed the Ultra-Sensitive Dove, as an additional security test. (On newer Visa cards, the UV dove is replaced by a small V over the Visa logo.) Beginning in 2005, the Visa standard was changed to allow for the hologram to be placed on the back of the card, or to be replaced with a holographic magnetic stripe ("HoloMag"). The HoloMag card was shown to occasionally cause interference with card readers, so Visa eventually withdrew designs of HoloMag cards and reverted to traditional magnetic strips. Signatures Visa made a statement on January 12, 2018, that the signature requirement would become optional for all EMV contact or contactless chip-enabled merchants in North America starting in April 2018. It was noted that the signatures are no longer necessary to fight fraud and the fraud capabilities have advanced allowing this elimination leading to a faster in-store purchase experience. Visa was the last of the major credit card issuers to relax the signature requirements. The first to eliminate the signature was MasterCard Inc. followed by Discover Financial Services and American Express Co. Sponsorships Olympics and Paralympics Visa has been a worldwide sponsor of the Olympic Games since 1986 and the International Paralympic Committee since 2002. Visa is the only card accepted at all Olympic and Paralympic venues. Its current contract with the International Olympic Committee and International Paralympic Committee as the exclusive services sponsor will continue through 2032 and 2020 respectively. This includes the Singapore 2010 Youth Olympic Games, London 2012 Olympic Games, the Sochi 2014 Olympic Winter Games, the Rio de Janeiro 2016 Olympic Games, the 2018 PyeongChang Olympic Winter Games, and the Tokyo 2020 Olympic Games. In 2002, Visa became the first global sponsor of the IPC. Visa extended its partnership with the International Paralympic Committee through 2020, which includes the 2010 Vancouver Paralympic Winter Games, the 2012 London Paralympic Games, 2014 Sochi Paralympic Games, 2018 Pyeongchang Paralympic Games and 2020 Tokyo Paralympic Games. Others Visa was the jersey sponsor of Argentina's national basketball team at the 2015 FIBA Americas Championship in Mexico