Soldiers need to be able to communicate on a noisy, dangerous battlefield even when conventional means of communication are unavailable.
To help meet that need, the US Army has just updated its compilation of hand and flag signals.
One configuration of flags signifies “Chemical, biological, radiological, and nuclear hazard present”:
Or a soldier may need to signal “I do not understand,” as follows:
See Visual Signals for Armor Fighting Vehicles (Combined Arms), GTA 17-02-019, US Army, February 2018.
Nearly 150 organizations and government officials have endorsed the call to action and solutions for extreme heat, now public at HeatAgenda.US Washington, D.C. – July 7, 2026 – As millions of Americans continue to struggle to stay cool following one of the hottest Independence Day holidays on record, the Federation of American Scientists (FAS), one […]
Addressing rising heat will take all of us. Together, we can create heat-safe homes, workplaces, schools, childcare facilities, and communities – the backbone of a heat-ready nation.
We sat down with biomedical research pioneer Lee Hood to talk moonshots, metascience in medicine, and the Human Phenome Initiative.
DNA synthesis and export controls remain the primary regulatory safeguards against de novo production of harmful biological agents, yet governance frameworks lack the situational awareness and enforcement capacity to keep pace with rapidly falling technical barriers.