New crate type 'HealUnitsCrateAction' which heals all of the units that the collecting player has. Very rare. New 'ContainsCrate' trait which goes along with this - could be used to hide crates inside churches for example like in the original RA missions.

OpenRA.Mods.RA/Crates/HealUnitsCrateAction.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2012 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Crates
+{
+	class HealUnitsCrateActionInfo : CrateActionInfo
+	{
+		public override object Create(ActorInitializer init) { return new HealUnitsCrateAction(init.self, this); }
+	}
+
+	class HealUnitsCrateAction : CrateAction
+	{
+		public HealUnitsCrateAction(Actor self, HealUnitsCrateActionInfo info)
+			: base(self, info) { }
+
+		public override void Activate(Actor collector)
+		{
+			base.Activate(collector);
+			foreach (var unit in collector.World.Actors.Where(a => a.Owner == collector.Owner))
+			{
+				var health = unit.TraitOrDefault<Health>();
+				if (health != null && !health.IsDead)
+				{
+					health.InflictDamage(unit, unit, -(health.MaxHP - health.HP), null, true);
+				}
+			}
+		}
+	}
+}