Military organisers estimated that 70,000 people attended a 'Meet the Forces' day in Cardiff Bay on Sunday, at the end of the Nato summit Wales week.
Police have hailed the security operation - the largest the UK has ever seen - as a success, with 31 arrests made in total.
World leaders including Barack Obama left Wales on Friday, praising Newport and Cardiff for a warm welcome.
Organisers estimate that up to 70,000 people attended today's military open event in Cardiff Bay, to mark the end of the NATO summit.
Royal Navy Type 45 Destroyer HMS Duncan was the main attraction - and five other warships from NATO member states were also open to the public.
The British army and RAF also played a part - with children enjoying the chance to clamber aboard a military tank or jet.
Tom Sheldrick reports:
Top policeman at Nato Summit says stun grenades were destroyed an hour before they were set to explode in path of world leaders.
'Meet the Forces' day was a crowd puller on Sunday as warships open up their decks in Cardiff Bay following Nato summit.
The day began with a spectacular fly-past over Cardiff and Newport by Nato aircraft.