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.
Thousands of people are in Cardiff Bay for a military open day after the NATO summit.
One of the Royal Navy's most advanced warships ever, Type 45 Destroyer HMS Duncan, and naval ships from five other NATO member states have been opened to the public.
RAF replica aeroplanes are on display, and army tanks and other vehicles available for visitors to try out.
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.