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King Willem-Alexander and Queen Maxima of the Netherlands arrive at the Dam memorial for the annual 4th of May Remembrance Day ceremony at Dam Square in Amsterdam, on May 4, 2017. / AFP PHOTO / ANP / Robin Utrecht / Netherlands OUT (Photo credit should read ROBIN UTRECHT/AFP/Getty Images)

King Willem-Alexander and Queen Maxima of the Netherlands arrive at the Dam memorial for the annual 4th of May Remembrance Day ceremony at Dam Square in Amsterdam, on May 4, 2017. / AFP PHOTO / ANP / Robin Utrecht / Netherlands OUT        (Photo credit should read ROBIN UTRECHT/AFP/Getty Images)

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AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attends the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attends the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

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AMSTERDAM, NETHERLANDS - MAY 4: King Willem-Alexander and Queen Maxima of The Netherlands attend the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

AMSTERDAM, NETHERLANDS - MAY 4: King Willem-Alexander and Queen Maxima of The Netherlands attend the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

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AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attendS the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attendS the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

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AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attendS the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)

AMSTERDAM, NETHERLANDS - MAY 4: Queen Maxima of The Netherlands attendS the National Remembrance ceremony at the National Monument on Dam Square on May 04, 2017 in Amsterdam, Netherlands. The ceremony is held annually and commemorates all civilians and members of the armed forces of the Kingdom of the Netherlands who have died in wars or peacekeeping missions since the outbreak of World War (Photo by Patrick van Katwijk/Getty Images)