A Ukrainian Air Force L-39 jet trainer crashed on Sept. 29, killing two of the occupants aboard.
![22135377_2023884197889650_8230079422996253961_o[1]](http://alert5.com/wp-content/uploads/2017/10/22135377_2023884197889650_8230079422996253961_o1.jpg)
DARPA’s ViSAR has completed flight tests
DARPA’s Video Synthetic Aperture Radar (ViSAR) program has completed flight tests, the research agency announced on Sept. 28.
![visar1[1]](http://alert5.com/wp-content/uploads/2017/10/visar11-1.jpg)
Footage shows MQ-9 being shot down in Yemen
Yemen’s Houthi forces claimed they had shot down an American MQ-9 over Sanaa on Oct. 1.
BAE Systems’ futuristic adaptable UAV
Jane’s: Russia has deployed second S-400 in Syria
Jeremy Binnie and Sean O’Connor at Jane’s Defence Weekly have confirmed the presence of another Russian S-400 air defense missiles system in Syria.
![4740814_original[1]](http://alert5.com/wp-content/uploads/2017/10/4740814_original1.jpg)
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