USP sacked John Cass and player assistant manager Tom Jeffes in the second half while Conner Grant finished the game in the bin.
But Jeffes was particularly aggrieved by his dismissal. The US captain from Portsmouth was sent off for manipulation on the goal line, although he claimed he had directed the ball out of danger.
The USP assistant coach said: “Me and Tom (Grice; USA manager from Portsmouth) are probably two of the fairest people. We are very honest, we don’t complain, we don’t blame not the others – we blame ourselves first – but I think in the last two games we had game-changing decisions that killed us in both games.
“If you’ve known me for 10 or 15 years, you’ll know I’ve never complained about officials.
“With me, five minutes from the end, I got the ball out of the head, which the referee gave nothing. The linesman somehow signaled 30 yards to say I would handball.
“Obviously he (the referee) went to consult the linesman, gave the penalty, gave me a straight red card.”
Cass was the first American player from Portsmouth to give his marching orders having not accepted the referee’s decision to send him to the sin-bin in the 66th minute.
The big speech of the match then came five minutes from the end. Jeffes cleared the ball from the line, the referee first with the referee continuing play.
However, his assistant said Jeffes used his hand so he was sent off and Owen Fee scored the free kick.
Things got worse for US Portsmouth as Wayne Robinson doubled the visitors’ lead in second-half timeout before Conner Grant was sent to sin-bin for the remainder of the game, leaving the hosts with only eight players on the field.
n The AFC Portchester notched four wins on the spin with a 2-0 victory over Hythe & Dibden, the bottom of the Wessex League division.
Defender Zak Sharp scored the opening goal in the first half before Lamin Jatta completed the scoring after the restart.