The phrase "acting guards" is correct and usable in written English.
It can be used to refer to individuals who are performing the duties of guards, either temporarily or in a specific context.
Example: "During the event, the acting guards ensured that all attendees followed the safety protocols."
Alternatives: "temporary guards" or "on-duty guards".
Italian diplomats say the marines, who were acting as guards on the Italian-flagged merchant ship, fired only warning shots and did so in international waters.
Italian diplomats say the marines, who were acting as guards on the Italian-flagged merchant ship, fired only warning shots and did so in international waters, Mr. Bajaj writes.
Around it were stationed soldiers who were acting as guards; and there was a throng of people, some gazing mournfully upon the corpse, whose face was covered, others weeping pitifully.
"If you are having a dispute about automation, then the last thing you should do is show how the human factor of driving trains and acting as guards can be so disruptive.
Surrounded by barricades flying the Russian flag, the atmosphere feels volatile as young men, some wearing camouflage, mill around acting as guards.
A Palestinian American friend and I found ourselves denied entry into Tahrir by protestors acting as guards of the Square.
If free media are going to fulfill their vital functions, then the public needs assurance that the media are seeking the truth and acting to guard the public interest.
They found, to their surprise, that none of the families lived hand to mouth; even the poorest relied on complex combinations of financial strategies, including joining savings clubs, buying funeral insurance, and acting as "money guards" for neighbors.
Kevin, another neighbor, who like many of those interviewed in the aftermath of the shooting would not give his last name, said there were men from the neighborhood acting as security guards and checking for weapons at the front door.
The Star-Ledger of Newark reported today that Mr. McGreevey spent slightly more than $105,000 to fly his wife, several staff members and three state troopers acting as security guards to his ancestral homeland for a week in July.
