The Puma IFV program has been a problem child throughout its development with the failure to integrate the Spike LR missile system being just one of the many problems it's faced. I don't think the problem was with the Spike system as it's been fitted successfully to other vehicles but it was a cause for concern (and delays) with the Puma. The latest problem is that they're having difficulties with the software systems for the upgraded Spike II - the Puma continues to live up to its problem child reputation.