It can be found at the Hoover Dam. You'll find it laying next to a bed in the soldiers' quarters around the corner from Quartermaster Bardon.
Angela, my sweet.
How slowly time crawls without the touch of your lips. I know you're still angry I enlisted, but I did it for you and for country - I won't have Legion scum anywhere near you or on NCR soil. Those red-skirted pansies don't stand a chance against me, don't you worry your pretty little head.
Soon as my tour's up, I'll be home and you'll be in my arms again. I'll have a ring in my pocket and a question to pop. You know what I mean.