No troops have shown any symptoms of exposure, such as skin blistering.
[cnn.com]
Skin blisters may be aspirated and the fluid obtained analysed for thiodiglycol.
[slideshare.net]
Signs and symptoms may begin 4 to 8 hours after you are exposed: Red, burning, or itching skin Blisters Burning or red eyes Sneezing, runny nose, or nosebleeds Sore throat
[drugs.com]