During WWII, women were called up to serve as motorcycle dispatchers for messages for the British Royal Navy.

By 1939, it was clear that every able-bodied British seamen would be needed to serve on ships so the Royal Navy decided to reconstitute the Women’s Royal Navy Service—nicknamed "The Wrens"—which had been disbanded after World War I. Initially 3,000 women were enlisted to perform shore based duties thus freeing up their male counterparts to go to sea. The Royal Navy made the Wren's focus on land-missions abundantly clear using the recruitment slogan “Join the Wrens and Free a Man for the Fleet."

https://www.womenridersnow.com/pages/pioneers_the_female_dispatch_riders_of_world_war_II.aspx