page_title: Underway replenishment
section_title: Vertical replenishment
hierarchical_section_title: Underway replenishment / Methods / Vertical replenishment
caption_attribution_description: English: At sea aboard USS Nimitz (CVN 68) Jan 16, 2003 -- An SH-60H “Sea Hawk” assigned to the “Indians” of Helicopter Anti-submarine Squadron 6 (HS-6), transports ordnance back and forth from the Military Sealift Command ship USNS Walter S. Diehl (T-AO-193) to Nimitz during a morning vertical replenishment (VERTREP). Nimitz is currently undergoing Composite Unit Training Exercise (COMPTUEX) off the coast of San Diego. COMPTUEX is an exercise designed to train the ship, air wing and other vessels in the battle group to function as one fighting force. U.S. Navy photo by Photographer’s Mate Airman Shannon Renfroe. (RELEASED)
context_page_description: Replenishment at sea or underway replenishment is a method of transferring fuel, munitions, and stores from one ship to another while under way. First developed in the early 20th century it was used extensively by the United States Navy as a logistics support technique in the Pacific theatre of World War II, permitting U.S. carrier task forces to remain at sea indefinitely.
context_section_description: A third type of underway replenishment is vertical replenishment (VERTREP). In this method, a helicopter lifts cargo from the supplying ship and lowers it to the receiving ship. The main advantage of this method is that the ships do not need to be dangerously close to each other, so there is little risk of collision; VERTREP is also used to supplement and speed stores transfer between ships conducting CONREP. However, the maximum load and transfer speeds are both limited by the capacity of the helicopter, and fuel and other liquids cannot be supplied via VERTREP.
caption: A SH-60 Sea Hawk transferring stores between ships, 2003.
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