Based on the mission.sqm, I can see that the "stt.." items are some type of a vehicle or static object and not a soldier unit. The "Flag1" item is just a flagpole of some kind, and I'm sure you can change it with a normal flagpole.
Below is the sections from the mission.sqm that include those items.
class Vehicles
{
items=323;
class Item30
{
position[]={7936.412598,11.784625,3693.421143};
special="NONE";
id=59;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item31
{
position[]={7933.240234,10.823994,3734.437744};
azimut=165.000000;
special="NONE";
id=60;
side="EMPTY";
vehicle="sttasfaltka7";
skill=1.000000;
};
class Item32
{
position[]={7927.255859,10.527573,3744.519531};
azimut=145.000000;
special="NONE";
id=61;
side="EMPTY";
vehicle="sttasfaltka2";
skill=1.000000;
};
class Item33
{
position[]={7920.822754,10.109565,3748.460693};
azimut=117.498001;
special="NONE";
id=62;
side="EMPTY";
vehicle="sttasfaltka1";
skill=1.000000;
};
class Item34
{
position[]={7912.799805,9.533095,3749.546387};
azimut=94.570313;
special="NONE";
id=63;
side="EMPTY";
vehicle="sttasfaltka1";
skill=1.000000;
};
class Item35
{
position[]={7889.621094,9.438274,3749.547119};
azimut=90.000000;
special="NONE";
id=64;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item36
{
position[]={7865.277344,11.322491,3749.547119};
azimut=90.000000;
special="NONE";
id=65;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item37
{
position[]={7842.131836,11.740245,3749.545654};
azimut=90.000000;
special="NONE";
id=66;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item38
{
position[]={7817.788086,9.505478,3749.545654};
azimut=90.000000;
special="NONE";
id=67;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item39
{
position[]={7801.338867,9.731615,3768.346191};
azimut=-4.100643;
special="NONE";
id=68;
side="EMPTY";
vehicle="sttasfaltka7";
skill=1.000000;
};
class Item40
{
position[]={7805.307129,9.053528,3757.315918};
azimut=-24.100637;
special="NONE";
id=69;
side="EMPTY";
vehicle="sttasfaltka2";
skill=1.000000;
};
class Item41
{
position[]={7810.878418,9.084125,3752.228027};
azimut=-51.602619;
special="NONE";
id=70;
side="EMPTY";
vehicle="sttasfaltka1";
skill=1.000000;
};
class Item42
{
position[]={7818.554199,9.576341,3749.646484};
azimut=-74.530319;
special="NONE";
id=71;
side="EMPTY";
vehicle="sttasfaltka1";
skill=1.000000;
};
class Item43
{
position[]={7801.642578,11.315252,3784.809326};
special="NONE";
id=72;
side="EMPTY";
vehicle="sttasfaltka4";
skill=1.000000;
};
class Item72
{
position[]={7947.901855,12.177857,3750.779541};
azimut=-111.550003;
id=101;
side="EMPTY";
vehicle="Flags1";
leader=1;
skill=0.466667;
init="this setFlagTexture ""\Flags\USA.jpg""; this setFlagOwner (car)";
};
What I would recommend is for you to edit that mission.sqm, and replace those items with a medium-sized defualt object, such as an empty BRDM or something that is not already part of the mission. So for example, where each of those listings says
vehicle="sttasfaltka4", you would want to change the "stt..." part to "T55G". The "Flags1" sections would be changed to "flagcarrier".
You also want to delete those item names from the addons list in the mission.sqm. Below I will show the sections that you should delete.
addOns[]=
{
"sttasfaltka4",
"sttasfaltka7",
"sttasfaltka2",
"sttasfaltka1",
"Flags1",
};
addOnsAuto[]=
{
"sttasfaltka4",
"sttabel_desert",
"sttasfaltka7",
"sttasfaltka2",
"sttasfaltka1",
"Flags1",
What this will do is remove all the addons that are not available or known, and replace them with a T55. Once that is done, you open up the mission in the editor and look for any "Empty T55G" sitting around. If the item doesn't look like it's important, just delete it. If you think it might have been an important object, or is in a critical area, then choose something to replace it with based on what you think should go there. For example, if you see a T55 placed inside a tent and another one sitting out in the middle of nowhere, you can assume it is some kind of smaller object that probably doesn't have much use. Since none of those "stt..." items had assigned editor names, I assume they are not being used by any mission scripts. It appears they are just "eye-candy". Try out what I suggested, and see what you think. Empty T-55's would be all you need to look for.
And just to help make it easier, I am uploading the "fixed" version of the mission.sqm file. I have made the changes above, so before you load the mission up just replace the old mission.sqm with the one I have here. When you do open it up in the editor, look around for all the T-55's on the map. Determine if you want to replace them or delete them. Then just save the mission again and you are ready to go.