name the vehicles:
humvee01
humvee02
humvee03
you have to assign them at first, each loon where you want:
p1 assignAsDriver humvee01
or
p2 assignAsCargo humvee02
or
....and so on as you wish, then to command them to get In:
[p1,p2,p3,p4,p5] orderGetIn true
now they will enter the vehicles as you assigned them.
About the lead officer they should follow, write some more info about him.
Where he is, is he in one of these humvees or in other vehicle.....?