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.
Most adults need 7 or 8 hours of sleep each night to feel fully alert during the day. This is usually also true for people age 65 or older.But as we get older, we might have more trouble sleeping. Many things can get in the way of sleeping well or sleeping long enough to be fully rested.ost adults need 7 or 8 hours of sleep each night to feel fully alert during the day. This is usually also true for people age 65 or older.