Former service personnel are hoping to raise £25,000 to pay for a monument honouring their Dorset comrades who died in the Battle of the Somme.
The last colours of the regiment were dedicated in 2001
Around 58,000 British troops were killed, wounded or went missing on the first day of the battle on 1 July 1916.
Almost 500 men from the Devonshire and Dorset Light Infantry were among those who lost their lives.
The fundraisers want to erect an obelisk from Portland Stone at a site near Mouquet Farm in northern France.
Charles Cooper, curator of the Keep Military Museum in Dorchester, said: "The Battle of the Somme was the greatest battle of all time.
"There has never been a bigger battle since or a blacker day in the army's history and the Dorset's participation in that was significant.
"We want people to remember the Dorset name and the thousands of Dorset men who lost their lives in France, before it is forgotten now that the regiment is part of The Rifles."
The colours of the Devonshire and Dorset regiment, which had about 650 men, were laid up in January in preparation for it to become the 1st Battalion of the army's new larger light division called The Rifles the following month.
The move was part of an army reorganisation which was first announced in 2004.
The appeal has already raised £3,000 and enough Portland stone to build the obelisk.