Which sustainable technology initiative was first widely deployed by the U.S. military in combat zones to reduce fuel convoy vulnerabilities and environmental impact?

The modern military sector faces increasing pressure to adopt sustainable practices while maintaining tactical superiority. From renewable energy on forward operating bases to eco-friendly ammunition, sustainability initiatives are transforming military operations. This poll tests your knowledge of how environmental considerations are changing the landscape of military technology and strategy in the 21st century.

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Solar-powered tactical operations centers, first deployed in Afghanistan in 2010
Biodegradable training ammunition, first used in large-scale exercises in 2015
Hydrogen fuel cells for armored vehicles, implemented in Iraq in 2008
Water purification systems using graphene filters, deployed in Syria in 2016