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.
We came out of the longest shutdown in history and we are all worse for it. Who won the shutdown fight? It doesn’t matter – Americans lost. And there is a chance we run it all back again in a few short months.
Promising examples of progress are emerging from the Boston metropolitan area that show the power of partnership between researchers, government officials, practitioners, and community-based organizations.
Americans trade stocks instantly, but spend 13 hours on tax forms. They send cash by text, but wait weeks for IRS responses. The nation’s revenue collector ranks dead last in citizen satisfaction. The problem isn’t just paperwork — it’s how the government builds.
In a new report, we begin to address these fundamental implementation questions based on discussions with over 80 individuals – from senior political staff to individual project managers – involved in the execution of major clean energy programs through the Department of Energy (DOE).