(1) not more than three vessels (cruisers or destroyers), but of these three vessels only one may exceed 3,000 tons (3,048 metric tons) standard displacement;
(2) one submarine.
(c) On retaining a vessel for target use, the High Contracting Party concerned undertakes not to recondition if for warlike service.
Section IV. Vessels retained for experimental purposes
(a) A vessel to be disposed of by conversion to experimental purposes exclusively shall be dealt with in accordance with the provisions of Section III (a) of this Annex.
(b) Without prejudice to the general rules, and provided that due notice be given to the other High Contracting Parties, reasonable variation from the conditions prescribed in Section III (a) of this Annex, in so far as may be necessary for the purposes of a special experiment, may be permitted as a temporary measure.
Any High Contracting Party taking advantage of this provision is required to furnish full details of any such variations and the period for which they will be required.
(c) Each High Contracting Party is permitted to retain for experimental purposes exclusively at any one time:
(1) not more than two vessels (cruisers or destroyers), but of these two vessels only one may exceed 3,000 tons (3,048 metric tons) standard displacement;
(2) one submarine.
(d) The United Kingdom is allowed to retain, in their present conditions, the monitor "Roberts", the main armament guns and mountings of which have been mutilated, and the seaplane carrier "Ark Royal", until no longer required for experimental purposes. The retention of these two vessels is without prejudice to the retention of vessels permitted under (c) above.
(e) On retaining a vessel for experimental purposes the High Contracting Party concerned undertakes not to recondition it for warlike service.
Section V. Vessels retained for training purposes
(a) In addition to the rights already possessed by any High Contracting Party under the Washington Treaty, each High Contracting Party is permitted to retain for training purposes exclusively the following vessels:
United States: 1 capital ship ("Arkansas" or "Wyoming");
France: 2 surface vessels, one of which may exceed 3,000 tons (3,048 metric tons) standard displacement;
United Kingdom: 1 capital ship ("Iron Duke");
Italy: 2 surface vessels, one of which may exceed 3,000 tons (3,048 metric tons) standard displacement;
Japan: 1 capital ship ("Hiyei"), 3 cruisers ("Kuma" class).
(b) Vessels retained for training purposes under the provisions of paragraph (a) shall, within six months of the date on which they are required to be disposed of, be dealt with as follows:
1. Capital Ships
The following is to be carried out:
(1) removal of main armament guns, revolving parts of all barbettes and turrets; machinery for operating turrets; but three turrets with their armament may be retained in each ship;
(2) removal of all ammunition and explosives in excess of the quantity required for target practice training for the guns remaining on board;
(3) removal of conning tower and the side armour belt between the foremost and aftermost barbettes;
(4) removal or mutilation of all torpedo tubes;
(5) removal or mutilation on board of all boilers in excess of the number required for a maximum speed of eighteen knots.
