Two British soldiers using Wireless Set № 18 Mk.I  radio/receiver/transmitter, somewhere  on the Western Front.

Portable communications

British sailors with quad-machine guns (0.5 Vickers Mk. III) on a ship.
The Mark III was a naval version used as an anti-aircraft weapon, mostly by the Royal Navy and allied navies in World War II, typically in mountings of 4 guns. The naval quad mount featured a 200 round magazine per barrel, with a maximum rate of fire of 700 rounds per minute, per gun. The four-barrel mounting had its guns adjusted to provide a spread of fire, amounting to 60 feet wide and 50 feet high at 1,000 yards (15–18 m at 915 m). The belts were wrapped around large drums which carried 200 rounds per gun. Vickers claimed that it could fire all 800 rounds in 20 seconds and could then be reloaded in a further 30 seconds.
 



Quad-machine guns

Ordnance crew is rearming the wing machine guns with fresh ammunition belt on the British Supermarine Spitfire.