This is an anti war t-shirt, it is not aimed at servicemen or women from an particular country, but at the war machine symbolized by the tank. I can’t think that anybody would be pro war but I can understand people supporting their armed forces as individuals.
Dogs were once used as anti tank mines. The dogs would be starved, then trained to find food under a tank. The dogs quickly learned that being released from their pens meant to run out to where a tank was parked and find some food. Once trained, the dogs would be fitted with an explosive charge and set loose into a field of oncoming tanks. When the dog went underneath the tank — where there was less armour — the charge would detonate and gut the enemy vehicle. This tee is also for all the dogs blown up in the name of war.