husband going out

My husbands in a police academy... where he learns and does physical crap 6 days a week ontop of work. We have two kids. It's not been easy but we have been getting through despite not seeing him a lot on a weekly basis. This Friday he wants to go out with the guys from academy. 7 guys one lesbian and one straight chick.  All academy cadets. To drink and eat. Mostly drink but states he'd be coming home after. Obviously no drinking and driving. He did this a month ago as well.  I know I may be just over reacting or an anxious type but I feel uncomfortable with it. Can someone please tell me to relax? I know I have a right to not be ok with my husband going to bars and drinking without me there but because it's his fellow cadets and it's after academy on Friday it feels more okay. He has cheated before we married along time ago and had done a great deal to make up for it. And we have come a long way and I do truly think he'd never do it again or I wouldn't have married him. He keeps in contact with me during him being gone and usually makes love to me when he comes home. I don't want to be that wife that says no to him having a little down time and enjoying himself. I think I just get sad he's with them more than his own family right now because of the schedule he has and a part of me gets irritated he's going out with them too. I shouldn't feel so nervous or maybe it's jealousy ? That they got to spend time with him and do stuff with him and I rarely do?  
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To let you know as well I'm an emergency trauma RN, I put in 40 hours every weekend. I'm also getting my masters degree right now. We have a ten year old and ten month old. I manage work school the house and kids. I never have time just to myself let alone with him. He works a full time job and is at academy from 5-10 every night. We never see each other. So yes I think in large part it has to do with that. Also a part of me feels like it's a little rude or inappropriate if my husband is out at a bar getting drunk. I've had a situation before when someone I work with ran into him at a bar when he was out with his cadets and talked about it at work (seeing him). Asked me where I was etc. so  I think it also depends what their doing , where they are. Just feels trashy in part. Just doesn't feel right having my husband out drinking somewhere. He hasn't even started his police career yet he's in academy.