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.
How to Stay Awake Naturally. With more and more of us getting less and less sleep, itâs tempting to reach for a Red Bull or an espresso when we feel sleepy at work. But consuming caffeine to combat sleepiness can lead to a vicious cycle. The java jolt that helps you stay awake can take up to eight hours to wear off. Caffeine can also reduce your sleep time, alter the normal stages of sleep, and decrease the quality of your sleep.