Same old same old, at the expense of people who think that they are doing their country a service. That's geopolitics, and geopolitics benefits the financial interests who run those countries.
Beaumont Hamel was a disaster and a tragedy, and in NF, July 1st is rightly regarded as a day of mourning.
In 1914, the Germans burned babies (bogus propaganda) and that got hundreds of thousands of men to volunteer for a quick war to kick the Hun in the rear end; we wound up with disasters like the Somme. In reality, FRance, Germany, Austria and Russia were jockying for power, especially France that was hankering to retake Alsace and Lorraine they lost to the Prussians during the Franco-Prussian war. 1990, Iraqi soldiers dumped babies out of incubators so they could ship them (sans babies) to Baghdad, and that got hundreds of thousands to do their partiotic duty and volunteer to destroy Iraq. In reality, the incubator story was nonsense; Rumsfeldt, Cheney, Wolfowitz et. al. then went to grab Iraqi oil under the pretext of WMD's and because Saddam was going to start trading oil in Euros (that resulted in dumping Iraq into Iranian hands; a massive US foreign policy blunder was the result, culminating in the creation of ISIS). The Viet-Nam war was started with a US false flag operation (Gulf of Tonkin incident) so they could grab offshore oil interests in Viet-Nam, under the pretext of preventing the domino effect.
WW2 was an exception, because Uncle Adolf was an evil man. However, the origin was the winners of WW1 that imposed such draconian conditions on the losers, that only a dictator could get them out of it.
All to say that patriotism is used as the pretext to get the population to volunteer into mass sacrifice, but the beneficiaries are the big industrialists and financers who reap huge profits from war production. During WW2, Ford owned Opel, and Opel was manufacturing German Army trucks.
Nowadays, as NATO is losing it's reason for being, they are manufacturing consent for war with Russia so that the military-industrial complex can continue to make profits feeding a new arms race and selling to their new NATO members equipment that will replace their Soviet inventory. For Canada, jobs and profits trump principles as we are selling 15 billion dollars of armoured vehicles to the Saudi one-family rule dictatorship, where there are no established civil rights, and where women are treated as chattel.
So go ahead: heed the call to battle. But just remember who you're going to sacrifice yourself for.