"二炮" was formerly an arm of the Armed Forces of China, and in recent years has been elevated almost to the status of a fourth service. But, after all and all, the established version for it has over the years been "The Second Artillery Force", as for 对抗演练, the established version in the field of military affairs has been Countermeasures Exercise

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Note added at 2 days6 hrs (2007-04-19 23:39:08 GMT) Post-grading
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1月5日，第二炮兵某旅演兵场上硝烟四起，一场激烈的“红”“蓝”对抗拉开新年开训序幕。形式多样的对抗火药味十足，打击与反打击、偷袭与反偷袭等30多个演练课目，使官兵在对抗中感受到实战氛围。
"某旅" Means the exercise is launched by a single unit, i.e. a brigade, where portions of the unit acts separately as the "Blue" and "Red" parties, so they are staging a countermeasure exercise against each other.