In The 18th Century, The Royal Navy Rationed “Proof Spirits”, Later Dubbed “Navy Strength”, For Their Ships’ Crews. These Spirits With ABVs Exceeding 55%, Were Stored Alongside Gunpowder, And Were Intentionally Kept At A Higher Proof To Protect The Powder From Damage Should The Spirit Leak From Their Barrels, And Drench The Munitions.