KM.stone

Kilo-stones are road stones marking distances in kilometers. The word is similar to milestone, but refers to kilometers instead of miles.So, this string of kilo-stones or cypresses "stretches" ahead of you. You are a young soldier, just 18 years of age. You shall travel along this road of life until you die. In a war, you could die at any moment. If you are spared, you could live to be 80 years of age. If you are unlucky, you will be killed by the next shell.The imagery being used is that of a road stretching out ahead of the 'young soldier'. The kilo-stones are the distance markers on the road, as others have commented. The reference to cypresses gives it away; cypress trees being commonly used to line country rounds all over Europe.