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.
FAS announces its first collective bargaining agreement with International Association of Machinists and Aerospace Workers (IAM) District 4.
We’ve identified the key ingredients of successful moonshots that meet the moment, and developed recommendations about what future efforts can and should look like.
We sat down with biomedical research pioneer Lee Hood to talk moonshots, metascience in medicine, and the Human Phenome Initiative.
Complex systems – from ecological to political to socio-technical – rarely change the way we expect.