Syria can enter at any level and climb, rather than buying the whole system at once.
Maintenance, software and upgrades
↑ Cost, technical demand and institutional depth rise with each step
Each step reuses the training, ammunition, communications and maintenance of the one below, which is what makes the next Turkish purchase cheaper than a switch to another supplier. Maintenance, software and future upgrades attach at every level rather than sitting at the top, and they are the layer hardest to replace once it is in place.
The National Context