Palmer Luckey and Mark Zuckerberg ended their bitter feud to bolster Silicon Valley’s new love affair with the military market

It’s not the duo you might have imagined.

On Thursday, as weapons startup Anduril and social media giant Meta announced a partnership to design new virtual and augmented reality devices for the U.S. military, the companies shared a photo of Anduril founder Palmer Luckey and Meta CEO Mark Zuckerberg standing side-by-side in the Meta offices—smiling!

You’d never guess from the chummy photo that, just eight years ago, Zuckerberg’s company (back when it was still called Facebook)...