Service is a type of Employment. Employment can cause/lead to Depression. Depression is related to Sad. Sad is related to Hurt. 
Killing can be used for Duty. one thing you do when you Killing is Smoke. Smoke is related to Bad. Terrorism can be Bad. 
Service --IsA--> Employment --Causes--> Depression <--RelatedTo--> Sad <--RelatedTo--> Hurt 
Duty <--UsedFor-- Killing --HasSubevent--> Smoke <--RelatedTo--> Bad <--HasProperty-- Terrorism 