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.
How DOE can emerge from political upheaval achieve the real-world change needed to address the interlocking crises of energy affordability, U.S. competitiveness, and climate change.
As Congress begins the FY27 appropriations process this month, congress members should turn their eyes towards rebuilding DOE’s programs and strengthening U.S. energy innovation and reindustrialization.
Politically motivated award cancellations and the delayed distribution of obligated funds have broken the hard-earned trust of the private sector, state and local governments, and community organizations.
In the absence of guardrails and guidance, AI can increase inequities, introduce bias, spread misinformation, and risk data security for schools and students alike.