here is a small part of my script (wich has this issue; this kind of script works fine on Arma2 though):

mission.sqm:

position[]={1698.2432,5.5,5647.019};
azimut=-183.77901;
special="NONE";
id=0;
side="WEST";
vehicle="B_Soldier_SL_F";
player="PLAYER COMMANDER";
leader=1;
rank="LIEUTENANT";
skill=0.60000002;
init="[""PL"", this] call compile preprocessFileLineNumbers ""Orbat\USINFkitout.sqf"";group this setGroupId [""1'6""]"; description="1 Platoon / Platoon Leader";

Gear script:

removeallweapons _unit;
removeallcontainers _unit;
removeallassigneditems _unit;

_unit addWeapon "ItemMap";
_unit addWeapon "ItemCompass";
_unit addWeapon "ItemWatch";
_unit addItem "FirstAidKit";

switch (_type) do
{

		case "PL":
		{
		_unit adduniform "U_B_CombatUniform_mcam_vest";
		_unit addvest "V_BandollierB_khk";		
		_unit addheadgear "H_MilCap_mcamo";			
		_unit addWeapon "ItemGPS";
		_unit addMagazine "HandGrenade";	
		_unit addMagazine "HandGrenade";
		_unit addMagazine "Smokeshell";	
		_unit addMagazine "SmokeshellRed";	
		_unit addMagazine "SmokeshellGreen";
		_unit addMagazine "SmokeshellGreen";	
		for "_i" from 0 to 6 do {_unit addMagazine "30Rnd_65x39_caseless_mag"};	
		_unit addMagazine "30Rnd_65x39_caseless_mag_Tracer";	
		_unit addWeapon "arifle_MXC_ACO_point_grip_F";		
		_unit addItem "optic_Hamr";
		};

Issue is specific to personalized gearscripts. Have seen this occur with multiple missions from multiple mission makers. Don't think this ticket should be deleted except if we have been doing something wrong...

might be related with http://feedback.arma3.com/view.php?id=2063 since when this occurs the character will call "No ammo"