The best replacement for 21 gun salute is 3 round volley.

The best alternatives to 21 gun salute are rated as following:
★★★★★  3 round volley
★  3 volley salute
★  18 gun salute

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Speaking about 21 gun salute, one probably shouldn't forget about taps.

Other search terms related to 21 gun salute and their ratings are:
★★★★★ taps
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21 gun salute
3 round volley
3 volley salute