ABERDEEN PROVING GROUND, Md. — In 1917, the United States formally entered World War I, joining the Allied Forces on the Western Front. As one of the first wars in modern history to usher in the use ...

When Germany unleashed chlorine gas at Ypres in 1915, it marked the dawn of modern chemical warfare. Soldiers had no masks, no protection—only panic and death. Was this the most inhumane weapon of WWI ...

The FINANCIAL — Two Dutch intelligence agencies said on Friday that Russia is increasing its use of prohibited chemical weapons in Ukraine, including the World War I-era poison gas chloropicrin. The ...