NATO Retires the Warship Exemption

For decades a warship could lie at a foreign berth with a full magazine and, in regulatory terms, carry its own exemption ashore. Edition D of the alliance's ammunition storage guidance, promulgated in November 2025, has removed that exemption. In its place sits a safety management system: assess the risk, mitigate it, decide on it, and communicate it, with the host nation's agreement. Status has been replaced by risk, and the shift matters most for the ships that feed the fleet.

Allied Ammunition Storage and Transport Publication 1 (AASTP-1) is NATO's controlling guidance for the storage of ammunition and explosives. Its treatment of ports lives in Part IV, Chapter 6, "Naval and Military Ports". The document's own change record is unusually blunt about what Edition D did to that chapter, and it is the anchor for everything that follows.

From status to risk: the new backbone

Under the outgoing model a berth's treatment turned on an identity question. Was the vessel a warship? If so, and if it was quiescent, it could occupy an unlicensed berth. Edition D deletes that gate. The port chapter now applies one common technique to every vessel carrying, loading or unloading ammunition and explosives (AE), in commercial, naval or military ports alike, and it decides the berth by consequence, not by flag.

Step one: meet the quantity-distances

The backbone is a single equivalence. A ship loaded with ammunition is treated, for separation-distance purposes, as a storage site, and the quantity-distances (QD) applied are the Part I above-ground storage tables at Annex I-A. Every hazard division is addressed and the Part I mixing and aggregation rules apply, so a mass-detonating nature drives the treatment of the whole load. The assessor treats the vessel as a single potential explosion site using the total Net Explosive Quantity (NEQ) or a calculated Effective NEQ, and only escalates to a multi-magazine model if the simpler one cannot meet the distances. Barricade credit is available where the physics supports it: ammunition sufficiently below the waterline, a qualifying jetty wall, or the bows and sterns of vessels moored in tandem. Hard operating rules sit alongside the distances, most notably that all AE except minimal Safety of Life at Sea (SOLAS) and force-protection natures must be offloaded before dry-docking, and that bulk fuelling and ammunition handling may not happen together at the same pier.

Loading and unloading: where the threshold bites

One practical threshold sits beneath all of this and decides whether an overseas port call is even feasible. Minimal SOLAS and force-protection stores carried ready for use fall outside quantity-distance altogether, and small quantities can be moved under limited top-up arrangements at a suitably licensed berth. Above those limits the position is unforgiving: any loading or unloading of ammunition that exceeds the small-quantity or SOLAS thresholds invokes the full quantity-distances, and that in turn requires an explosives-licensed harbour. Where no licensed berth exists, the ammunitioning must instead be taken out of the port, to a licensed anchorage or to sea for replenishment. For a task group in a foreign port with no licensing scheme, that is frequently the deciding factor: either the transfer stays within the top-up limits, or it is conducted at sea rather than alongside.

Step two: where QD cannot be met, run the safety management system

NATO explosives safety policy requires QD to be applied, and states that where they cannot be met the risk-based approach must be used. This is the machinery that has replaced the exemption. The national authority applies a safety management system that runs the four-part risk-based decision process set out in Part IV, Chapter 2: risk assessment, risk mitigation, risk decision, and risk communication. The assessment draws on NATO's risk methodology in AASTP-4 (overview and consequence models) and AASTP-5, with the operational process in Allied Logistics Publication 16. It weighs the probability of an event, a detailed consequence analysis, and the temporary exposure of personnel and third parties, the very factors a fixed distance cannot capture.

Within that system, the quiescent state is named as a common mitigation applied to military vessels. It is not an entitlement and it is not automatic. Edition D makes it valid only when four conditions are met together:

1. all AE is stowed and secured in its designated magazines or explosives lockers;
2. no AE movement, electrical testing or reprogramming takes place on board;
3. fully functioning AE firefighting capabilities are in place; and
4. the national and impacted nations' authorities have accepted this alternative safety management system.

Whose acceptance the system requires

The fourth condition is the heart of the reform. The quiescent state, used as the alternative to meeting QD, is only good once it has been accepted by the national authority of the flag or sending state and by the impacted nations' authorities, meaning the host port state and any other nation whose vessels, personnel or infrastructure sit at the exposed sites around the berth. NATO has taken a risk that a sending state used to be able to carry into a foreign harbour on the strength of its own ensign, and made it a decision the host nation must now share. The reciprocity is the point: the state that gains from a movement is frequently not the state whose people and infrastructure sit at the exposed sites around the berth. Edition D turns that imbalance into a precondition, requiring the impacted nation's authorities to accept the alternative safety management system before it can be relied on.

The national layer, and why it still matters

AASTP-1 is guidance for nations to implement, so what a given navy actually does at a berth is set by national law sitting on top of the alliance backbone. In the United Kingdom that is the Defence Ordnance, Munitions and Explosives safety regime, DSA 03.OME Part 2 (the successor to the withdrawn JSP 482): Chapter 10-04 for ports QD and licensing, Chapter 26 for naval bases and military ports, and Chapter 1 for the overseas policy that the Secretary of State applies UK standards where reasonably practicable and, in addition, meets the host nation's expectations. The vessel's magazine is regulated under the Naval magazine regulations, JSP 862, and a warship in harbour under the maritime safety regulations DSA 03.DMR, supplemented on an interim basis by Naval Authority Notice 10/2005. Below all of this sits the civilian benchmark the UK measures itself against: the Dangerous Goods in Harbour Areas Regulations 2016, the Dangerous Substances and Explosive Atmospheres Regulations 2002, and the Explosives Regulations 2014.

Here is the point that gives the story its edge. The current UK national regime still contains the warship exemption that NATO has just removed. DSA 03.OME Chapter 10-04, in its 2020 text, still allows explosives carried within a British or foreign warship covered by the Warships in Harbour regulations to enter a harbour without a licence, and Chapter 26 still makes the quiescent state a property of a warship. NATO and the UK are, for the moment, out of step.

What this means for the fleet support ship

The reform reframes the question that this analysis set out to answer. The older concern was that a Royal Fleet Auxiliary (RFA), being a merchant-crewed ship rather than a commissioned warship, fell through the warship exemption and had to earn a licensed or surveyed berth while a grey-funnel warship did not. That gap is real under the outgoing model, and it rests on a genuine legal fact: an RFA is owned by the Ministry of Defence but crewed by civilian professional seafarers on Merchant Navy terms, flies the RFA ensign rather than the White Ensign, and fails the command and discipline limbs of the warship definition in Article 29 of the United Nations Convention on the Law of the Sea. It is a state vessel operated for non-commercial purposes, immune as such, but not a warship.

Edition D changes the shape of the problem. Once the warship exemption is gone, there is no identity gate for anyone to pass or fail. The warship and the auxiliary are handled by the same technique: meet the quantity-distances, or run the safety management system and secure national and host-nation acceptance. The auxiliary is no longer uniquely disadvantaged by what it is; instead the whole fleet moves onto a risk basis, and the auxiliary's position converges with the warship's. It is worth being precise about the limit of this claim: Edition D does not define "military vessel", and it leaves to national law the question of which vessels may use the quiescent state at all. So the reform removes the NATO-level status bar, but whether a particular RFA may rely on the quiescent state remains a national decision, now taken jointly with the host nation.

For the planner the live risk is therefore not the old gap but the transition. Between now and the end of the phase-in there are two regimes in play: a UK national rulebook that still exempts the quiescent warship, and an alliance standard that exempts nobody and is already available as an alternative means of compliance. A UK task group and its auxiliaries operating alongside allies who have already adopted Edition D can find the same berthing event assessed two different ways. A solid support ship arriving in a foreign port that has no explosives-licensing scheme, to berth and re-supply, is exactly the case the new pathway governs: it can claim no status exemption, so it must meet the quantity-distances or run the safety management system with host-nation acceptance. Under Edition D that is simply the normal case for every vessel that cannot meet the distances, warship or auxiliary alike.

The shift at a glance

The graphic contrasts the outgoing status gate with the Edition D risk pathway, and sets out the UK adoption timeline underneath.

Sources and evidence base

Source ratings use the NATO STANAG 2022 scale (reliability A to F, accuracy 1 to 6). Primary regulatory instruments rate A1 to A2.

1. AASTP-1 Edition D Version 1 (November 2025): change record para 24 (complete replacement of Part IV Ch 6; removal of the warship exemption, replaced by a safety management system); Part IV Ch 6 (QD equivalence to storage, port operations, quiescent-state conditions at §4.6.4); Part IV Ch 2 (QD-based vs risk-based approach; four-part risk decision process). Reference library. A1.
2. DOSR Regulatory Notice 2025-07, Project COWLEY (9 July 2025): UK adoption of NATO AASTP-1 QD tables from 1 January 2028; AAMC status now; ~5-year phased transition; NATO First rationale. Reference library. A1.
3. DSA 03.OME Part 2 (formerly JSP 482): Ch 10-04 (ports QD/licensing; warship exemption §1.1.2), Ch 26 (naval bases & ports; quiescent state as a warship property; DSA 03.DMR + Naval Authority Notice 10/2005), Ch 1 §1.2 (overseas policy). Reference library. A1.
4. AASTP-4 (risk analysis) and AASTP-5 (deployed-storage risk methodology); ALP 16 (Explosives Safety and Munitions Risk Management). Reference library. A1.
5. UK civilian benchmark: Dangerous Goods in Harbour Areas Regulations 2016; DSEAR 2002; Explosives Regulations 2014 (HSE / legislation.gov.uk). A1.
6. UNCLOS 1982, Article 29 (definition of warship). Treaty text. A1.
7. Royal Fleet Auxiliary status, crewing and ensign (MoD-owned; civilian Merchant Navy crewing under RFA regulations; own RFA ensign). Navy General Board; Wikipedia (RFA). B2.
8. Hero image: "Navy Cargo Handlers Offload Ammunition", Kilo Wharf, Guam, 5 May 2023. U.S. Navy photo by Ivan Skvaril, VIRIN 230505-N-DB921-162, Commander Task Force 75. Public domain, via DVIDS (dvidshub.net/image/7786778). A1.