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People don't always get to know when their last transmission will be their final transmission in a communication. Life is very dynamic and so is radio. Conditions might change. You might not be able to make further contact with another station. You might be on a repeater and another ham moves in and talks over you. You just don't always get to know when your last chance to talk will be. You could ID at the end of each transmission to play it extra safe, and some hams do this. It's just not necessary, and your intent will be the deciding factor when such an oversight is observed. When saying 73 - good bye then be ensure to include your call sign. If you're going to stick around and monitor, then don't worry about it.Q: How worried should I be about concluding a communication with my call sign? A: People don't always get to know when their last transmission will be their final transmission in a communication. Life is very dynamic and so is radio. Conditions might change. You might not be able to make further contact with another station. You might be on a repeater and another ham moves in and talks over you. You just don't always get to know when your last chance to talk will be. You could ID at the end of each transmission to play it extra safe, and some hams do this. It's just not necessary, and your intent will be the deciding factor when such an oversight is observed. When saying 73 - good bye then be ensure to include your call sign. If you're going to stick around and monitor, then don't worry about it.