Barely a day goes by without new concerns being raised about the pressures faced by British teachers.
Most recently, we were told that middle class mothers and fathers are raising pampered princes who believe the world revolves around them.
Other children come to school unable to speak - because parents have entrusted their upbringing to the television and DVD player.
Immigration brings new pressures on teachers, as they are try to cope with classrooms where a minority of pupils are native English speakers.
And school staff throw up their hands in horror at the prospect of larger classes - because they are swamped with paperwork even when pupil numbers are limited.
It's sometimes tempting to mock the litany of complaints emerging from the teaching profession, but this would be unfair.
Teachers do an essential and difficult job, and often receive little gratitude for it.
But sometimes, they can be their own worst enemies. With all the challenges they face, the National Union of Teachers has decided that one of their priorities should be keeping army recruiters out of schools.
Indeed, the union is even determined to prevent publicity material being displayed.
What this has to do with raising attainment levels in the classroom, or closing the gap between the most successful and least successful groups of pupils, is hard to see.
The NUT appears to believe it is making a statement about the Iraq war, but the primary role of the armed forces is to protect this country. Support for the armed forces is nothing to do with support for specific decisions made by individual politicians.
In Britain, our elected representatives decide how the armed forces are used, and are accountable to us for their decisions.
In any case, discouraging young people from joining the Army is not going to make any difference to the situation in Iraq.
What it will do is deprive students of the opportunity to consider the armed forces as a potential career.
Traditionally, the forces have provided opportunities for young people from a range of backgrounds to earn a living while learning new skills.
Today's Army provides training in a range of disciplines from engineering to catering.
Anyone who dislikes the idea of teenagers being encouraged to join the forces is entitled to their opinion.
But teachers must not use their position to impose their political views on pupils. They must let their students make up their own minds.