The phrase "army activity" is correct and usable in written English.
It can be used to refer to actions, operations, or events conducted by military forces.
Example: "The report detailed various army activities conducted during the training exercise."
Alternatives: "military operations" or "armed forces actions".
American agents all seem to have a story about suspicious Mexican Army activity.
In a last-ditch effort to re-establish control and respect, Mr. Sadr issued an order halting all Mahdi Army activity in August.
The intensified army activity was thought to relate to a sweep through a nearby village, Khirbet al-Jouz, at the entrance to which tanks and jeeps could be seen massing late on Thursday night.
The revelations are likely to prompt serious questions for the current Sri Lankan government, which includes several senior members of the cabinet who oversaw army activity during the last days of the conflict.
In February 1989 a lawyer in Northern Ireland named Patrick Finucane, who often defended those accused of Irish Republican Army activity, was eating dinner in his Belfast home with his wife and three children when Protestant paramilitary gunmen broke down the front door and killed him with a dozen shots at close range.
Yugoslav army activity, on the other hand, ebbed and flowed roughly in sync with the refugee movements and killings.
Dlugosz, whose parents were divorced, had a passion for horses as well as the army, which she had first fallen in love with at an army activities week at her school when the family were living in Somerset.
The army officer was later changed to a policeman because Sippy felt that it would be difficult to get permission to shoot scenes depicting army activities.
One, by the UN, is investigating the army's activities in East Timor after the Timorese voted for independence last August.
Like the activist bloggers in Syria who are working to undermine their enemies, Mr. Abunimah and his colleagues at the Electronic Intifada scour the Web for material to counter the effort by Israelis who use social media platforms to cast their army's activities in a positive light.
With attention to related documents and testimonies of "comfort women", Kang analyzes the viewpoint of the photographers, as well as the intent and nature of the army photographers' activities.
