ADF officers warned when wearing uniform

The Australian Defence Force has cautioned its members who publicly wear the uniform after an officer was allegedly assaulted by two men in Sydney's northwest.

ADF members have been warned to be careful when wearing their uniform after an officer was attacked. (AAP)

The Australian Defence Force has warned personnel to be careful when wearing their uniform in public following an alleged attack on an officer.

A Defence spokesperson says officers have been told to use their judgment when considering going out in uniform.

Police say a 41-year-old officer was in full uniform when he was allegedly assaulted by two men of Middle Eastern appearance in Bella Vista on Thursday morning.

The officer told police he was threatened and assaulted about 6.30am, leaving him with minor bruising.

Defence last week raised the alert level at all its bases and establishments.

The move came after the national terrorism public alert level was increased to high.