Chris,
While playing the 2nd Training Mission, I noticed an irregularity with one of my rifle squads as they approached the "attack position. I had given them an assault command on the previous turn. At the end of that turn, I noticed they had not moved. Upon further investigation, I saw the rifles of all 12 men (in Green) shown in the unit display, but could only see 8 men on the field. On the next turn I sent the squad forward with a Quick Command, yet the floating icon stayed with the original location, and only 8 men responded to the Quick Command. I never could find the other 4 men on the field.