Offered below are specific prayers for deployed troops/sailors/marines/airmen. These came for the Book of Common Prayer. I modified the Navy prayer so both prayers would be suitable for any of our centurions to use regardless of their nationality.
I added links to the prayers on our Order's "Prayer" page, just below the prayer of the Order.
For the Army (and Air Forces).
O LORD God of Hosts, stretch forth, we pray thee, thine almighty arm
to strengthen and protect the soldiers of our country; Support them in
the day of battle, and in the time of peace keep them safe from all
evil; endue them with courage and loyalty; and grant that in all
things they may serve without reproach; through Jesus Christ our Lord.
For the Navy (Marines, Coast Guard, Mechant Marines)
O ETERNAL Lord God, who alone spreadest out the heavens, and rulest
the raging of the sea; Vouchsafe to take into thy almighty and most
gracious protection our country's Navy, and all who serve therein.
Preserve them from the dangers of the sea, and from the violence of
the enemy; that they may be a safeguard unto our country, and a
security for such as pass on the seas upon their lawful occasions;
that the inhabitants of our land may in peace and quietness serve thee
our God, to the glory of thy Name; through Jesus Christ our Lord.