Speaking at the annual RUSI lecture, Air Chief Marshal Sir Stuart Peach played down the possibility of cuts to the Marines.
The Chief of the Defence Staff says any talk about cuts to the Royal Marines or their capabilities remains speculation.
He added that:
"The fighting prowess of the Royal Marines is, and will remain, world class. We are recognised as one of the few NATO nations that can deliver amphibious effect."
A £25 billion black hole in the defence budget has led to calls for a full defence review.
The RAF and Army have already been reduced, and there's concern the Year of the Navy could be marked by serious cuts.