No I do not think national service should be brought back. Theres no real reason for it these days and honestly, those who suggest it seem to see it as bascally, some sort of punishment for being young more than actual service/helping the country/whatever.
I have yet to see someone it would affect suggest it, it is always people who are older who seem to have..bitterness?..towards younger people for whatever reason.
I am probably past the age now where I would be drafted, and as a female and someone with a disablity I wouldn't be involved anyway I wouldn't think, but honestly, I think its an awful idea and seems to be borne out of dislike of the younger generation rather than owt else
(Edit. Adding in, it being criminals and such being drafted, wouldn't really work as they would just..well not do it right. Same for it being drug addicts as suggested in here too. Again, seems to be seen as punishment for being undesibrable in some way, more than anything. Though its slightly better to see it being 'criminals should do it' than more..'young people these days do nowt, send em out to die' type comments that it tends to be on FB and such)