Bouts of military load carriage are rarely completed in isolation; however limited research has investigated the physiological responses to repeated load carriage tasks. Twelve civilian men, (age, 28 ± 8 y; stature, 185.6 ± 5.8 cm; body mass 84.3 ± 11.1 kg; maximal oxygen uptake, 51.5 ± 6.4 mL·kg-1·min-1) attended the laboratory on two occasions to undertake a familiarisation and an experimental session. Following their familiarisation session, participants completed three bouts of a fast load carriage protocol (FLCP; ~65-minutes), carrying 25 kg, interspersed with a 65-minute recovery period. Physiological strain (oxygen uptake [V̇O2], heart rate [HR]) were assessed during the FLCP bouts, and physical performance assessments (weighted counter-movement jump [wCMJ], maximal isometric voluntary contraction of the quadriceps [MIVC], seated medicine ball throw [SMBT]) were measured pre- and post- each FLCP bout. A main effect for bout and measurement time was evident for V̇O2 and HR (both p<0.001, Ѡ2= 0.103-0.816). There was no likely change in SMBT distance (p=0.201, Ѡ2=0.004), but MIVC peak force reduced by approximately 25% across measurement points (p<0.001, Ѡ2=0.133). A mean percentage change of approximately -12% from initial values, was also evident for peak wCMJ height (p=0.001, Ѡ2=0.028). Collectively, these data demonstrate that repeated FLCP bouts result in an elevated physiological strain for each successive bout, along with a substantial reduction in lower body power (wCMJ and MIVC). Future research should therefore investigate possible mitigation strategies, to maintain role-related capability.