The Gold Commander of this week's D-Day 75 event in Portsmouth has told us it will be one of Hampshire's largest ever policing operations.
Police officers from across the county are helping with the event at Southsea Common, which it's estimated more than 60,000 people will attend.
On Wednesday this week US President Donald Trump, who begins his UK state visit today, will join Her Majesty The Queen and other world leaders in the city to mark the occasion.
Assistant Chief Constable of Operations David Hardcastle has told us the security measures in place will be extensive:
"You'll see vehicle barriers in place, we'll have mobile patrols out, automatic number plate recognition and CCTV.
"As we go through the next few days you'll see the Marine Unit, Roads Policing Unit, Commercial Vehicles Unit and even officers on horses and with dogs out on patrol."
(Above: Security barriers are in place at various locations near Southsea Common - picture credited to Jon Weeks)
Assistant Chief Constable of Operations David Hardcastle added:
"What we're saying to people is please be our eyes and ears on the ground.
"If you see anything suspicious or concerning please alert us - and we'll come and check it out and make sure everything is in order."
Police having been posting updates on social media, to make people aware of what they're doing in the area to prepare for the event.
You will have seen some of our security measures in #Southsea over the past 2 weeks, including our armed officers pictured on patrol today – there’s also lots you can’t see. Don’t worry, it's all in place to keep you safe as we prepare for #DDay75 Come and say hi if you see us. pic.twitter.com/qbjhgV77WO— Portsmouth Police (@PompeyPolice) June 1, 2019