dm. Designated Marksman. military marksman role in a U.S. infantry squad. The DM's role is to supply rapid accurate fire on enemy targets at ranges up to 870 yds with a highly-accurate semi-automatic rifle equipped with a telescopic sight.he DM's role is to supply rapid accurate fire on enemy targets at ranges up to 870 yds with a highly-accurate semi-automatic rifle equipped with a telescopic sight.
The average person is awake for about 14 to 16 hours per day. Most could extend that to about 20 hours if they were to stay up later; up to 40 hours is easy once a person gets beyond the 24 hour mark; longer than 60 hours (staying awake straight through two nights and three days) is rare, but doable; the record is 264 hours or 11 days straight. Hannah Griffiths.
To return to the original question, How long can humans stay awake? the ultimate answer remains unclear. Despite the rat studies in Chicago, I am unaware of any reports that sleep deprivation per se has killed any human (excluding accidents and so forth). Indeed, the U.S. Department of Defense has offered research funding for the goal of sustaining a fully awake, fully functional 24/7 soldier, sailor, or airman.