Poland has run into problems with its first batch of Piorun Man-portable air-defense system (MANPADS).
By Ministerstwo Obrony Narodowej (http://mon.gov.pl/pl/galeria/1931) [Attribution], via Wikimedia Commons
It has now been revealed that one missile exploded in controlled-testing in September last year.
Subsequent investigations found that the rocket motor was produced without quality controls.
Poland had placed an order of $220 million with Mesko for 1,300 missiles and 420 missile launchers.