Règle correspondante
Peru
Practice Relating to Rule 65. Perfidy
Section H. Simulation of protected status by using other internationally recognized emblems
Peru’s IHL Manual (2004) states that the “perfidious use of … other recognized protective emblems” is a war crime. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 31.a.(8); see also § 172.h.
The manual further states:
Medical personnel must refrain from any act that can be classed as a war crime against persons or property protected under international humanitarian law. These include:
(5) deliberate misuse of … other recognized protective emblems (act of perfidy), causing death or seriously endangering physical health or integrity. 
Peru, Manual de Derecho Internacional Humanitario para las Fuerzas Armadas, Resolución Ministerial Nº 1394-2004-DE/CCFFAA/CDIH-FFAA, Lima, 1 December 2004, § 83.f.(5).
Peru’s IHL and Human Rights Manual (2010) states that the “perfidious use of … recognized protective emblems” is a war crime. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, 32(c)(1)(a)(8), p. 248.
The manual further states:
Medical personnel must refrain from any act that can be classed as a war crime against persons or objects protected under international humanitarian law. These include:
(5) Deliberate misuse of … other recognized protected signs, causing death or seriously endangering physical health or integrity. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 74(f)(5), p. 273.
The manual also prohibits the following acts as being perfidious:
Carrying out hostile operations of any kind, even aerial reconnaissance, under cover of aircraft registration numbers or markings belonging to … humanitarian agencies, non-governmental organizations and international agencies engaged in eminently humanitarian or neutral functions. 
Peru, Manual de Derecho Internacional Humanitario y Derechos Humanos para las Fuerzas Armadas, Resolución Ministerial No. 049-2010/DE/VPD, Lima, 21 May 2010, § 156, p. 339.