Lest we forget

Since 1914, the Poppy has been used as a symbol for support of serving soldiers, former soldiers and their families. As well as a symbol to commemorate soldiers that have fallen or been injured in conflict zones.

As early as the Napoleonic wars, the blood-red poppies were described, as the first that grew on the torn battlefields.

"Lest we forget” is an expression commonly used in military-related commemoration events.
For example when singing Rudyard Kiplings poem, "Recessional", in which a verse reads:

The tumult and the shouting dies;
The Captains and the Kings departure:
Still stands Thine ancient sacrifice,
An humble and a contrite heart.
Lord god of Hosts, be with us yet,
Lest we forget—lest we forget!