We report the successful completion and initial testing of the Lockheed Martin first-article, single-stage, compact, coaxial pulse tube microcryocooler. This cryocooler supports cooling requirements for emerging high operating temperature (125-150K) infrared focal plane array sensors with nominal cooling loads of ~500mW@125K. We present new coaxial pulse tube cooling performance test measurements with comparisons to the design predictions and the in-line pulse tube measurements. The microcryocooler exhibits small size, volume, weight, power and cost features that warrant further component enhancements and manufacturing process maturation for a variety of space and tactical applications.