Teachers are accusing the Ministry of Defence of using "sophisticated" methods to lure youngsters, often in deprived areas, into the armed forces.
Teachers have voted to oppose military recruitment activities in schools if they employ "misleading propaganda".
National Union of Teachers delegates in Manchester will debate a motion later calling for an end to "recruitment" in schools in England and Wales.
Young people must be given a true picture of Army life, not a "marketised version", the National Union of Teachers conference heard.
Teachers say pupils are not made fully aware of what they are signing up to.
The Ministry of Defence denies actively recruiting in schools but says it does visit to raise awareness when invited in by head teachers.
The MoD says it is invited into about 1,000 schools a year, but its teams go to raise awareness not recruit.
Some teachers complain the Army uses sophisticated methods of recruitment.
'Informed choices'
Paul McGarr, a teacher from east London, said only when recruiting materials gave a true picture of war would he welcome them into his school.
Catherine Brennan, a teacher from Croydon, south London, who is presenting the motion, said recruiters use information which does not allow young people to make informed choices.
These would have to say: "Join the Army and we will send you to carry out the imperialist occupation of other people's countries," he said.
"They are too young to vote, too young to drink, too young to drive, but they are considered old enough to sign up for years in the armed forces without being fully aware of what they are signing themselves up for in their lives," she said.
"Join the Army and we will send you to bomb, shoot and possibly torture fellow human beings in other countries.
We are talking about a much more sophisticated method of recruitment Teacher Chris Kelly
"Join the Army and we will send you probably poorly equipped into situations where people will try to shoot or kill you because you are occupying other people's countries.
Another teacher, Chris Kelly, from Lambeth, south London, said: "The Ministry of Defence has got a programme for distributing information to every secondary school. They run programmes across the country and send army personnel to talk to young people in schools.
"Join the Army, and if you survive and come home, possibly injured or mentally damaged, you and your family will be shabbily treated."
"These are often in areas of high levels of unemployment."
Humanitarian work, such as digging wells in war-ravaged Sierra Leone, is often highlighted alongside the chance to improve interpersonal skills.
Mr Kelly added: "We are talking about a much more sophisticated method of recruitment - putting eligible young people who are good communicators in assembly halls."
'Limited opportunities'
'Limited opportunities'
NUT general secretary Steve Sinnott told reporters before the NUT conference that he was concerned youngsters from poorer backgrounds were being targeted.
NUT general secretary Steve Sinnott told reporters before the NUT conference that he was concerned youngsters from poorer backgrounds were being targeted.
It's all small things but it's self-discipline. The Army for me, and for many others, was a fantastic life Ex-soldier Terry
It's all small things but it's self-discipline. The Army for me, and for many others, was a fantastic life Ex-soldier Terry
"Youngsters from the most disadvantaged backgrounds have more limited opportunities in life than youngsters from better off backgrounds.
"Youngsters from the most disadvantaged backgrounds have more limited opportunities in life than youngsters from better off backgrounds.
"It's simply a fact. I am not saying that youngsters from disadvantaged backgrounds cannot get something from a career in the military."
"It's simply a fact. I am not saying that youngsters from disadvantaged backgrounds cannot get something from a career in the military."
A spokesman for the Ministry of Defence said: "We do not recruit in schools.
A spokesman for the Ministry of Defence said: "We do not recruit in schools.
"The single-service schools teams visit about 1,000 schools a year between them only at the invitation of the school - with the aim of raising the general awareness of their armed forces in society, not to recruit."
"The single-service schools teams visit about 1,000 schools a year between them only at the invitation of the school - with the aim of raising the general awareness of their armed forces in society, not to recruit."
Roger Leighton, head teacher of Sydney Russell School, in Dagenham Essex, said people could have a fantastic life with a career in the armed forces.
Roger Leighton, head teacher of Sydney Russell School, in Dagenham Essex, said people could have a fantastic life with a career in the armed forces.
"I can't see any problem with the army coming in and recruiting in schools," he added.
"I can't see any problem with the army coming in and recruiting in schools," he added.
Ironing
Ironing
And ex-soldier Terry told BBC Radio Five Live that the union's attitude was patronising to 16-year-olds.
And ex-soldier Terry told BBC Radio Five Live that the union's attitude was patronising to 16-year-olds.
"Now 16-year-olds are not kids - they know, they know their mind," he said.
"Now 16-year-olds are not kids - they know, they know their mind," he said.
"If they are not sure what they want to do and they are just tinkering with the idea of just going in the Army - nowadays they can go in the Army, they go on a six-week camp and they find out what it's like.
"If they are not sure what they want to do and they are just tinkering with the idea of just going in the Army - nowadays they can go in the Army, they go on a six-week camp and they find out what it's like.
"If its not for them, they have the choice to leave."
"If its not for them, they have the choice to leave."
Based on his own experience he would never dream of asking his partner to press a shirt for him or sew on a button.
Based on his own experience he would never dream of asking his partner to press a shirt for him or sew on a button.
"If I am hungry I cook for myself. It's all small things but it's self-discipline. The Army for me, and for many others, was a fantastic life."
"If I am hungry I cook for myself. It's all small things but it's self-discipline. The Army for me, and for many others, was a fantastic life."
Has the army visited your school or the school of a relative? Have you or any children you know been encouraged to join the army through a school visit? Send us your comments using the form below:
Has the army visited your school or the school of a relative? Have you or any children you know been encouraged to join the army through a school visit? Send us your comments using the form below:
