the Israeli military did a study about ~15 years ago where they looked at soldier suicide rates after they had enacted a policy of leaving the weapons at base over the weekend and if I recall correctly it cut the rate of suicides by 40-50%.

And on the flip side, the US Sec Def recently allowed US soldiers to carry loaded weapons on base (when not in a role that required it, which was previously disallowed). I expect this will increase suicides on US military bases. All for some "rah rah, 2A, mah rights!!!" bullshit political posturing.

The US Veteran's Affairs agency makes a free app to help with insomnia; it has all the usual advice that would apply to anyone - plus advising veterans not to keep a loaded gun by the bed, even if it makes them feel safer going to sleep.

I bet that has as much to do with where and when alcohol is consumed as it does guns.