Second World War, the only leaders to have done so have been French president Charles de Gaulle in 1960, South African president Nelson Mandela in 1996, Pope Benedict XVI in 2010, U.S. president Barack Obama in 2011, Burmese opposition leader Aung San Suu Kyi in 2012, and Ukrainian president Volodymyr Zelenskyy in 2023. President Obama was the first US president to be invited to use the Hall for an address to Parliament and Aung San Suu Kyi was the first non-head of state to be given the accolade of addressing MPs and peers in Westminster Hall. Following reforms in 1999, the House of Commons now uses the Grand Committee Room next to Westminster Hall as an additional debating chamber. (Although it is not part of the main hall, these are usually spoken of as Westminster Hall debates.) In contrast with the two main Chambers, in which the government and opposition benches directly face each other, the seating in the Grand Committee Room is laid out in a U-shape, a pattern meant to reflect the non-partisan nature of the debates there. Other rooms There are two suites of libraries on the Principal Floor, overlooking the river, for the House of Lords Library and House of Commons Library. The Palace of Westminster also includes state apartments for the presiding officers of the two Houses. The official residence of the Speaker stands at the northern end of the Palace; the Lord Chancellor's apartments are at the southern end. Each day, the Speaker and Lord Speaker take part in formal processions from their apartments to their respective Chambers. The Strangers' Bar is one of the numerous bars, cafeterias and restaurants in the Palace of Westminster, with differing rules regarding who is allowed to use their facilities; many of them never close while the House is sitting. There is also a gymnasium, a hair salon; and a rifle range. Parliament also has two souvenir shops, where items on sale range from House of Commons key-rings and china to House of Commons Champagne. Security The Lady Usher of the Black Rod oversees security for the House of Lords, and the Serjeant at Arms does the same for the House of Commons. These officers, however, have primarily ceremonial roles outside the actual chambers of their respective Houses. Security is the responsibility of the Parliamentary Security Director. Parliament has its own professional security force. Tradition still dictates that