Highly doubtful any US Military guys, who are probably gun owners themselves, are going to try and take guns away from fellow Americans.
They already did in New Orleans after Katrina. Video proof is out there on Youtube.
http://www.youtube.com/watch?feature=player_embedded&v=kf8trl69kzo
http://www.youtube.com/watch?feature=player_embedded&v=K52h9m0_OiY
From your lips to God’s ears.
I am not so sure. When you start impacting people’s livelihood, careers, and future, the line is not so clear. I think many of the soldiers would follow orders, because of what they face by disobeying the orders—prison,loss of job, etc. It would need to be a flash-mob sort of mentality to occur for many to actually disobey that order. This sort of thing occurs daily in jobs everywhere, an employee has a problem with a supervisor, but push come to shove, it is likely not going to happen that a fellow employee will stand with em because of the potential loss of job and all that goes with it by standing with the employee.