One main argument against is that it would lead to a breakdown in discipline. Has any such breakdown been observed in the armed forces of those countries such as Australia and Holland, where gays are allowed to serve? Are we to assume that the personnel of HM forces are too immature and uncertain about their own sexuality to cope?
Finally, it is the great conceit of heterosexual men that gays are "after them". They can rest assured that this is a fallacy, the vast majority of gay men are just not interested in them.
I suspect that opposition to gays comes from the blimpish old guard who remain at the top at the MoD. The younger generation are far too well adjusted and comfortable with their sexuality to perceive any threat from working alongside gays.
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