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Mexico
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
Mexico’s Army and Air Force Manual (2009) states: “It is prohibited to: … B. declare that no quarter will be given.” 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 389(B).
Mexico’s IHL Guidelines (2009), in a section entitled “Basic rules of conduct in armed conflict”, states: “Give the enemy the opportunity to surrender.” 
Mexico, Cartilla de Derecho Internacional Humanitario, Ministry of National Defence, 2009, § 14(m).