Charity Tickets For Troops has teamed up with the RFU and Harlequins to offer 250 free pairs of tickets for England vs Canada.
The Red Roses take on their opponents at the Twickenham Stoop this Sunday.
The match follows England's record-breaking 56-15 trouncing of New Zealand at Franklin's Gardens last weekend when Quins hooker and RAF provost officer Amy Cokayne scored a historic hat-trick of tries.
The Red Roses last played at the Stoop in April when they won the 2021 Women's Six Nations Trophy against France.
England women's head coach said Simon Middleton said his side are "pleased" to be returning to the stadium.
A Tickets For Troops spokesperson said: "This is a great opportunity for members of the Armed Forces to see top quality rugby at a fantastic venue.
"We are very grateful to both the RFU and Harlequins Rugby Club.”
The match kicks off at 2.30pm at The Stoop on Sunday.