You can’t compare not allowing one to take Communion with not allowing one to show their respect when tragedy happens.
The LMCS also does not allow inter commuion. It is a safe guard within the Catholic Church to restrict only Catholics who know that they are actually receiving the Body, Blood, Soul and Divinity of Christ in the Eucharist, where we are warned in scripture that one is not to take communion unless he recognizes it is truely His flesh and blood and is without mortal sin. To do so is to call judgement upon themselves. So the Church is actually trying to avoid those not in compliance with Christ’s words with damning themselves. What the Lutheran thought for denying those outside the LMCS from taking communion is, I have no idea. I believe other Lutheran bodies are not allowed to receive communion from LMCS churches either. However, in the Catholic Church all Catholics and at times Orthodox Christians may receive as they have the correct understanding of Holy Communion.
The was just an event, it had nothing to do with doctrine, nor participating in a communion service. I would assume then that LMCS clerics would also be forbidden from attending a funeral or memorial service for our fallen soldiers as I am sure that the services are interfaith, in the sense that those attending might be from many different denominations including clerics. That is, if you carry your logic to its end.
Who knows their real reason for this rule, as I said I know very little about the LMCS, but find other Lutheran Synods more unifying Christians as a whole.
God Bless Bernadette