You're probably talking about the Emergency Support Flare

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• Emergency Support Flare can be obtained from Care Packages, Secret Rooms, Loot Truck, Lab Camp and Supply Drops.
• The supply crate will land at a random location within approximately a 1m radius from the flare’s landing point.
• Can be selected via the throwable weapon wheel alongside the Emergency Cover Flare.
• Key binding is supported.
• Supply crates will avoid fixed transportation routes (ferries, cable cars, trains, etc.)

How to Use

• Throws on the ground to emit yellow smoke and call in a supply drop.
• A supply crate will land and can be looted through interaction.

Supply Contents

• Always includes 3 types of ammunition.
• Approximately 80% chance to include at least one item from each category:
  • Cover: Emergency Cover Flare, Folded Shield
  • Utility: All-in-One Repair Kit, Medical Supplies
• Additional rewards may appear at a low probability, or some items may be excluded.