Initial upload. Not currently functional as a mod. Includes some slightly refactored source code as well as the original mission this was debuted in zipped up as reference + example of usage.

functions/fn_materielCheck.sqf

@@ -0,0 +1,29 @@
+// temporary function - likely to be replaced in proper mod development context
+
+params ["_hq", "_player"];
+
+// Grab all Depots at the HQ
+private _baseDetails = _hq getVariable "baseDetails";
+private _depots = _baseDetails get "depots";
+if (_depots isEqualTo []) exitWith { 
+	[
+		"CLF_ShowMessage",
+		[
+			1,
+			0,
+			"No connected supply depots found."
+		],
+		_player
+	] call CBA_fnc_targetEvent;
+	// Return false;
+	false;
+};
+
+// Check current materiel available at this base
+private _currentMateriel = 0;
+{
+	_currentMateriel = _currentMateriel + (_x getVariable ["currentMateriel", 0]);
+} forEach _depots;
+
+// Return result
+_currentMateriel;