The df command provides information on file system usage, but includes quite a few options. This post examines the differences and makes some suggestions about when you should use which of the two ...

Summary: China’s military strategy includes a significant focus on expanding its arsenal of Dong-Feng 21 (DF-21D) ballistic missiles, known as “carrier killers,” to counter U.S. naval capabilities.

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Following what became a historic countdown, PLA Sergeant Major Zhao Jing tapped the laptop before him, declared “launch sequence initiated”, and exited the cabin of the missile vehicle he had ridden ...

In testimony before the U.S. Senate’s Committee on Armed Services last week, Admiral Charles A. Richard, the commander of U.S. Strategic Command, discussed a range of developments in the strategic ...

An image of a hypersonic glider-like object broadcast by Chinese state media in October 2017. No known images of the DF-17’s hypersonic glide vehicle exist in the public domain. Credit: CCTV screen ...

From the front the Nikon Df is a striking camera, boasting a retro design that we think will appeal to old and new Nikon users alike, especially when the matching special edition silver-banded 50mm ...

The DF-21D Was China’s First Aircraft Carrier Killer Missle – There has been much hype around the People’s Liberation Army’s (PLA’s) DF-26B (Dong Feng-26), a road-mobile, two-stage solid-fueled ...

Images, and the devices that capture them, are my focus. I've covered cameras at PCMag for the past 14 years, which has given me a front row seat for the changeover from DSLRs to mirrorless cameras, ...