It's even part of the Marine Corps Rifle Creed:
This is my rifle. There are many like it, but this one is mine.
My rifle is my best friend. It is my life. I must master it as I must master my life.
My rifle, without me, is useless. Without my rifle, I am useless. I must fire my rifle true. I must shoot straighter than my enemy who is trying to kill me. I must shoot him before he shoots me. I will...
My rifle and myself know that what counts in this war is not the rounds we fire, the noise of our burst, or the smoke we make. We know that it is the hits that count. We will hit...etc.
"My rifle and myself." Huh? There must be millions who have read (or had to recite) that and cringed. How incredible that it can have been composed, vetted, approved and published without anyone correcting it. Myself wonders: What is wrong with the word "I"?
Grammatical note: Myself is one of a group of reflexive pronouns (others are himself, itself, yourself, themselves), meaning the action reflects back on the person or thing: I hurt myself. He washed himself. The car found itself in the ditch.