Start the Editor.
Choose Stratis.
Insert a Rifleman AT as Player (BLUFOR/Blue/Men/Rifleman (AT)).
Click on the Preview button.
Hit numpad 'enter' to enter 3rd person view.
Double tap left-control to lower weapon.
Hold 'w' to move forward.
While moving forward right mouse click to aim down sights.
Right mouse click to leave aim down sights.
Locked in forward movement with left arm hanging down to model's side.