First Lady Michelle Obama will meet British-based American military families on the final stop of her visit to the UK.
She will greet families stationed at RAF Mildenhall in Suffolk after a trip which has seen her lead the presidential delegation at the London 2012 Games.
Along with Dr Jill Biden, Mrs Obama last year launched Joining Forces, a US-wide scheme aimed at recognising and taking action to support the families of American service personnel.
The initiative has highlighted the issues that particularly affect military families in areas such as employment, education and general well-being.
The visit is the final engagement for Mrs Obama on her tour of Britain, during which she backed Team USA, met the nation's Olympians at their training base in east London and attended a Let's Move! event at the US Ambassador's residence.
At the Regent's Park event, children from American military bases across the UK played with British youngsters, joining in sports such as basketball, tennis and football.
Mrs Obama told the gathering that Olympic athletes are not born, but work hard for success and refuse to give up.
Let's Move! is a scheme created by the First Lady to combat childhood obesity within a generation.
After enjoying a ring-side seat at the opening ceremony and attending a reception for heads of state at Buckingham Palace, she cheered on US athletes at events.
During her London visit, Mrs Obama has said the Olympics were particularly special to her family because of her father's battle with multiple sclerosis. She told how he went from a "thriving competitor" to being unable to walk.