The phrase "as guards of" is correct and usable in written English.
It can be used to describe a role or responsibility of protecting or overseeing something or someone.
Example: "The volunteers served as guards of the ancient ruins, ensuring that no damage was done to the site."
Alternatives: "as protectors of" or "as custodians of".
There were undoubtedly some skeletons in the airport company's closet, arising from its intermittent desire to pour cement over age-old villages and its skill in encouraging us to circumnavigate the globe on unnecessary journeys, laden with bags of Johnnie Walker and toy bears dressed up as guards of the British monarchy.
A Palestinian American friend and I found ourselves denied entry into Tahrir by protestors acting as guards of the Square.
They act as guards of honour at some Government House functions and attended the restoration opening of the Albany, Western Australia fort, and the annual re-enactment of the Battle of Waterloo in Keyneton, Victoria.
The continuous presence of neuroserpin orthologs equipped with C-terminal signal sequences assigning residence within the secretory pathway documents that serpins functioning as guards of the cellular export/import routes represent an ancient trait.
Initially, Klein served in the royal house guard for the King of France, holding the prestigious position as guard of the gate.
Six steel-helmeted officers, all recipients of the Knight's Cross of the Iron Cross, escorted the coffin on its caisson and stood as guard of honour during the ceremony: Oberstleutnant Günther Radusch, Oberstleutnant Hans-Joachim Jabs, Major Rudolf Schoenert, Hauptmann Heinz Strüning, Hauptmann Karl Hadeball and Hauptmann Paul Zorner.
The contractors, who worked as guards for Blackwater Worldwide, are accused of firing wildly from their convoy.
White-uniformed sailors serve as his guards of honour.
Unwieldy and expendable, these craft floated downstream to leave their cargoes and occupants as advance guards of American political and economic expansion.
Administration was consolidated by the settlement, probably as frontier guards, of the Székely (Szeklers, a people akin to the Magyars) and the Saxons (Germans).
In some areas of the world, dogs are used as guards or beasts of burden or even for food, whereas in the United States and Europe dogs are protected and admired.
