Two men who battled insurgents as Prince Harry and his fellow troops came under attack at Camp Bastion are among 118 military personnel being honoured today.
Other heroes include a medic on her first tour of duty who treated an injured serviceman as Taliban bullets whistled overhead.
ITV News Correspondent Martha Fairlie met some of them:
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.