A thin loop surrounding the trigger of a weapon to keep it from accidental discharge.

of, or relating to a rearguard / of, or relating to resistance in politics etc

A physical barrier to protect something from unwanted contact, especially a shield to prevent accidental tripping of an emergency shutdown or power switch.

A mesh screen placed in front of a fire to prevent sparks escaping.

The organisation or officer enforcing maritime law and policing the seas within territorial waters.

Not vigilant; unprepared; inattentive. / Unexpectedly or by surprise.

A decommissioned aircraft, artillery piece, or tank, displayed near the entrance to an airport or military base.

A (comparatively) conservative, reactionary faction that is more unwilling to accept new ideas than their peers are. / Collectively, the members of a team who have been a long time in a place.

Alternative spelling of advance guard

A unit or units leading the way of advancing or marching troops, guarding them from ambushes, reconnoitering and pursuing the enemy, etc. / An individual soldier in the same role.